1) Atoms contain positively charged protons, neutral neutrons, and negatively charged electrons. Electrons orbit the dense, positively charged nucleus at the center of the atom.
2) Rutherford discovered the nucleus through alpha particle scattering experiments. His model showed electrons orbiting the tiny, dense nucleus. Bohr added that electrons can only orbit in discrete energy levels.
3) Elements are defined by their atomic number, or number of protons. Isotopes are atoms of the same element with different numbers of neutrons, giving them different mass numbers.
This pdf is written to describe structure of atom for school students of grades 9 to 10. In this the basics of atomic structure has been described. Starting from Dalton's atomic model to Rutherford's scatering of alpha particles, JJ Thomson and Bohr's models with photos.
Students can download and use it for studying atomic structure.
Hello everyone, I am Dr. Ujwalkumar Trivedi, Head of Biotechnology Department at Marwadi University Rajkot. I teach Molecular Biology to the students of M.Sc. Microbiology and Biotechnology.
The current presentation is about the historical perspectives of the discovery of atoms and subatomic particles. The later part of the presentation describes various atomic models and the properties of subatomic particles with a description of commonly used terms like molecules, ions and compounds.
This pdf is written to describe structure of atom for school students of grades 9 to 10. In this the basics of atomic structure has been described. Starting from Dalton's atomic model to Rutherford's scatering of alpha particles, JJ Thomson and Bohr's models with photos.
Students can download and use it for studying atomic structure.
Hello everyone, I am Dr. Ujwalkumar Trivedi, Head of Biotechnology Department at Marwadi University Rajkot. I teach Molecular Biology to the students of M.Sc. Microbiology and Biotechnology.
The current presentation is about the historical perspectives of the discovery of atoms and subatomic particles. The later part of the presentation describes various atomic models and the properties of subatomic particles with a description of commonly used terms like molecules, ions and compounds.
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The carbon cycle is a critical component of Earth's environmental system, governing the movement and transformation of carbon through various reservoirs, including the atmosphere, oceans, soil, and living organisms. This complex cycle involves several key processes such as photosynthesis, respiration, decomposition, and carbon sequestration, each contributing to the regulation of carbon levels on the planet.
Human activities, particularly fossil fuel combustion and deforestation, have significantly altered the natural carbon cycle, leading to increased atmospheric carbon dioxide concentrations and driving climate change. Understanding the intricacies of the carbon cycle is essential for assessing the impacts of these changes and developing effective mitigation strategies.
By studying the carbon cycle, scientists can identify carbon sources and sinks, measure carbon fluxes, and predict future trends. This knowledge is crucial for crafting policies aimed at reducing carbon emissions, enhancing carbon storage, and promoting sustainable practices. The carbon cycle's interplay with climate systems, ecosystems, and human activities underscores its importance in maintaining a stable and healthy planet.
In-depth exploration of the carbon cycle reveals the delicate balance required to sustain life and the urgent need to address anthropogenic influences. Through research, education, and policy, we can work towards restoring equilibrium in the carbon cycle and ensuring a sustainable future for generations to come.
WRI’s brand new “Food Service Playbook for Promoting Sustainable Food Choices” gives food service operators the very latest strategies for creating dining environments that empower consumers to choose sustainable, plant-rich dishes. This research builds off our first guide for food service, now with industry experience and insights from nearly 350 academic trials.
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The objective of this work is to contribute to valorization de Nephelium lappaceum by the characterization of kinetics of drying of seeds of Nephelium lappaceum. The seeds were dehydrated until a constant mass respectively in a drying oven and a microwawe oven. The temperatures and the powers of drying are respectively: 50, 60 and 70°C and 140, 280 and 420 W. The results show that the curves of drying of seeds of Nephelium lappaceum do not present a phase of constant kinetics. The coefficients of diffusion vary between 2.09.10-8 to 2.98. 10-8m-2/s in the interval of 50°C at 70°C and between 4.83×10-07 at 9.04×10-07 m-8/s for the powers going of 140 W with 420 W the relation between Arrhenius and a value of energy of activation of 16.49 kJ. mol-1 expressed the effect of the temperature on effective diffusivity.
Willie Nelson Net Worth: A Journey Through Music, Movies, and Business Venturesgreendigital
Willie Nelson is a name that resonates within the world of music and entertainment. Known for his unique voice, and masterful guitar skills. and an extraordinary career spanning several decades. Nelson has become a legend in the country music scene. But, his influence extends far beyond the realm of music. with ventures in acting, writing, activism, and business. This comprehensive article delves into Willie Nelson net worth. exploring the various facets of his career that have contributed to his large fortune.
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Introduction
Willie Nelson net worth is a testament to his enduring influence and success in many fields. Born on April 29, 1933, in Abbott, Texas. Nelson's journey from a humble beginning to becoming one of the most iconic figures in American music is nothing short of inspirational. His net worth, which estimated to be around $25 million as of 2024. reflects a career that is as diverse as it is prolific.
Early Life and Musical Beginnings
Humble Origins
Willie Hugh Nelson was born during the Great Depression. a time of significant economic hardship in the United States. Raised by his grandparents. Nelson found solace and inspiration in music from an early age. His grandmother taught him to play the guitar. setting the stage for what would become an illustrious career.
First Steps in Music
Nelson's initial foray into the music industry was fraught with challenges. He moved to Nashville, Tennessee, to pursue his dreams, but success did not come . Working as a songwriter, Nelson penned hits for other artists. which helped him gain a foothold in the competitive music scene. His songwriting skills contributed to his early earnings. laying the foundation for his net worth.
Rise to Stardom
Breakthrough Albums
The 1970s marked a turning point in Willie Nelson's career. His albums "Shotgun Willie" (1973), "Red Headed Stranger" (1975). and "Stardust" (1978) received critical acclaim and commercial success. These albums not only solidified his position in the country music genre. but also introduced his music to a broader audience. The success of these albums played a crucial role in boosting Willie Nelson net worth.
Iconic Songs
Willie Nelson net worth is also attributed to his extensive catalog of hit songs. Tracks like "Blue Eyes Crying in the Rain," "On the Road Again," and "Always on My Mind" have become timeless classics. These songs have not only earned Nelson large royalties but have also ensured his continued relevance in the music industry.
Acting and Film Career
Hollywood Ventures
In addition to his music career, Willie Nelson has also made a mark in Hollywood. His distinctive personality and on-screen presence have landed him roles in several films and television shows. Notable appearances include roles in "The Electric Horseman" (1979), "Honeysuckle Rose" (1980), and "Barbarosa" (1982). These acting gigs have added a significant amount to Willie Nelson net worth.
Television Appearances
Nelson's char
Natural farming @ Dr. Siddhartha S. Jena.pptxsidjena70
A brief about organic farming/ Natural farming/ Zero budget natural farming/ Subash Palekar Natural farming which keeps us and environment safe and healthy. Next gen Agricultural practices of chemical free farming.
UNDERSTANDING WHAT GREEN WASHING IS!.pdfJulietMogola
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Artificial Reefs by Kuddle Life Foundation - May 2024punit537210
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One of the key areas we work in is Artificial Reefs. This presentation captures our journey so far and our learnings. We hope you get as excited about marine conservation and artificial reefs as we are.
Please visit our website: https://kuddlelife.org
Our Instagram channel:
@kuddlelifefoundation
Our Linkedin Page:
https://www.linkedin.com/company/kuddlelifefoundation/
and write to us if you have any questions:
info@kuddlelife.org
Micro RNA genes and their likely influence in rice (Oryza sativa L.) dynamic ...Open Access Research Paper
Micro RNAs (miRNAs) are small non-coding RNAs molecules having approximately 18-25 nucleotides, they are present in both plants and animals genomes. MiRNAs have diverse spatial expression patterns and regulate various developmental metabolisms, stress responses and other physiological processes. The dynamic gene expression playing major roles in phenotypic differences in organisms are believed to be controlled by miRNAs. Mutations in regions of regulatory factors, such as miRNA genes or transcription factors (TF) necessitated by dynamic environmental factors or pathogen infections, have tremendous effects on structure and expression of genes. The resultant novel gene products presents potential explanations for constant evolving desirable traits that have long been bred using conventional means, biotechnology or genetic engineering. Rice grain quality, yield, disease tolerance, climate-resilience and palatability properties are not exceptional to miRN Asmutations effects. There are new insights courtesy of high-throughput sequencing and improved proteomic techniques that organisms’ complexity and adaptations are highly contributed by miRNAs containing regulatory networks. This article aims to expound on how rice miRNAs could be driving evolution of traits and highlight the latest miRNA research progress. Moreover, the review accentuates miRNAs grey areas to be addressed and gives recommendations for further studies.
Micro RNA genes and their likely influence in rice (Oryza sativa L.) dynamic ...
4structureoftheatom.ppt
1. CHAPTER - 4
STRUCTURE OF THE ATOM
CLASS :- IX
MADE BY :- MANAS MAHAJAN
SCHOOL :- K.V. GANESHKHIND PUNE-7
2.
3. 1a) Charged particles in matter :-
Atoms have three types of sub atomic particles. They are electrons,
protons and neutrons.
Electrons are negatively charged (e-), protons are positively
charged (p+) and neutrons have no charge (n).
The mass of an electron is 1/2000 the mass of a hydrogen atom. The
mass of a proton is equal to the mass of a hydrogen atom and is taken
as 1 unit. The mass of a neutron is equal to the mass of a hydrogen
atom and is and is taken as 1 unit.
b) Discovery of sub atomic particles :-
In 1900, J.J.Thomson discovered the presence of the negatively
charged particles called electrons in the atom.
In 1886, E.Goldstein discovered new radiations in gas discharge and
called them canal rays. These rays were positively charged. This later
led to the discovery of the positively charged particles called protons in
the atom.
In 1932 Chadwick discovered the presence of particles having no
charge in the atom called neutrons.
4. 2) Structure of an atom :-
a) Thomson’s model of an atom :-
According to Thomson an atom is similar to a Christmas pudding.
The pudding had positive charge and the electrons having negative
charge were like plums on the pudding.
He proposed that :-
i) An atom consists of a positively charged sphere and the electrons are
embedded in it.
ii) The negative and positive charges are equal in magnitude So the atom
as a whole is electrically neutral.
5. b) Rutherford’s model of an atom :-
Rutherford’s alpha scattering experiment :-
Rutherford allowed a beam of fast moving alpha particles ( α –
particles) having positive charge to fall on a thin gold foil. He observed
that :-
i) Most of the α – particles passed straight through the gold foil.
ii) Some of the α – particles were slightly deflected by small angles.
iii) Very few α – particles appeared to rebound.
6. Conclusions from Rutherford’s alpha scattering
experiment :-
i) Most of the space inside an atom is empty. (because most of the α –
particles passed straight through the gold foil.)
ii) The atom had a small nucleus having positive charge. ( because
some of the α – particles having positive charge were slightly
deflected by small angles.)
iii) The size of the nucleus is very small compared to the size of the
atom. (because very few α – particles appeared to rebound and
most of the positive charge and mass of the atom is in the nucleus.)
Rutherford’s model of an atom :-
i) An atom has a positively charged nucleus at its centre and most of
the mass of the atom is in the nucleus.
ii) The electrons revolve around the nucleus in different orbits.
iii) The size of the nucleus is very small compared to the size of the
atom.
7. Defects of Rutherford’s model of the atom :-
Any particle in a circular orbit would undergo acceleration
and during acceleration the charged particle would radiate
energy. So the revolving electrons would lose energy and
fall into the nucleus and the atom would be unstable. We
know that atoms are stable.
Negatively charged
electron
Positively charged
nucleus
Very small positively
charged nucleus
Negatively charged
electrons in orbits
around the nucleus
-
-
-
+
Rutherford’s model
of an atom
8. c) Bohr’s model of an atom :-
i) An atom has a positively charged nucleus at its centre and most of
the mass of the atom is in the nucleus.
ii) The electrons revolve around the nucleus in special orbits called
discrete orbits.
iii) These orbits are called shells or energy levels and are represented
by the letters K, L, M, N etc. or numbered as 1, 2, 3, 4, etc.
iv) While revolving in the discrete orbits the electrons do not radiate
energy. Shells or energy levels in an atom
9. 3) Distribution of electrons in different shells :-
The distribution of electrons in the different shells was
suggested by Bhor and Bury. The following are the rules for
filling electrons in the different shells.
i) The maximum number of electrons in a shell is given by
the formula 2n2 where n is the number of the shell 1, 2, 3
etc.
First shell or K shell can have = 2n2 = 2 x 12 = 2x1x1 = 2 electrons
Second shell or L shell can have = 2n2 = 2 x 22 = 2x2x2 = 8 electrons
Third shell or M shell can have = 2n2 = 2 x 32 = 2x3x3 = 18 electrons
Fourth shell or N shell can have = 2n2 = 2 x 42 = 2x4x4 = 32 electrons
and so on.
ii) The maximum number of electrons that can be filled in
the outermost shell is 8.
iii) Electrons cannot be filled in a shell unless the inner
shells are filled.
10. Composition of the atoms of the first eighteen elements :-
Name of
element
Symbol Atomic
Number
Number of
Protons
Number of
Neutrons
Number of
Electrons
Distribution
Of Electrons
K L M N
Valency
Hydrogen H 1 1 - 1 1 - - - 1
Helium He 2 2 2 2 2 - - - 0
Lithium Li 3 3 4 3 2 1 - - 1
Beryllium Be 4 4 5 4 2 2 - - 2
Boron B 5 5 6 5 2 3 - - 3
Carbon C 6 6 6 6 2 4 - - 4
Nitrogen N 7 7 7 7 2 5 - - 3
Oxygen O 8 8 8 8 2 6 - - 2
Fluorine F 9 9 10 9 2 7 - - 1
Neon Ne 10 10 10 10 2 8 - - 0
Sodium Na 11 11 12 11 2 8 1 - 1
Magnesium Mg 12 12 12 12 2 8 2 - 2
Aluminium Al 13 13 14 13 2 8 3 - 3
Silicon Si 14 14 14 14 2 8 4 - 4
Phosphorus P 15 15 16 15 2 8 5 - 3,5
Sulphur S 16 16 16 16 2 8 6 - 2
Chlorine Cl 17 17 18 17 2 8 7 - 1
Argon Ar 18 18 22 18 2 8 8 - 0
11. Atomic structure of the first eighteen elements :-
H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
12. 4) Valency :-
Valency is the combining capacity of an atom of an element.
The electrons present in the outermost shell of an atom are called
valence electrons.
If an atom’s outermost shell is completely filled, they are inert or
least reactive and their combining capacity or valency is zero.
Of the inert elements Helium atom has 2 electrons in the outermost
shell and the atoms of other elements have 8 electrons in their
outermost shell. Atoms having 8 electrons in their outermost shell is
having octet configuration and are stable.
If an atom’s outermost shell is not completely filled it is not stable. It
will try to attain stability by losing, gaining or sharing electrons with
other atoms to attain octet configuration.
The number of electrons lost, gained or shared by an atom to attain
octet configuration is the combining capacity or valency of the element
Eg :- Hydrogen, Lithium, Sodium atoms can easily lose 1 electron
and become stable. So their valency is 1. Magnesium can easily lose 2
electrons. So its valency is 2. Aluminiun can easily lose 3 electrons. So
its valency is 3. Carbon shares 4 electrons. So its valency is 4.
Fluorine can easily gain 1 electron and become stable. So its
valency is 1. Oxygen can easily gain 2 electrons. So its valency is 2.
Nitrogen can easily gain 3 electrons. So its valency is 3.
13. 5) Atomic number and Mass number :-
a) Atomic number (Z) :-
The atomic number of an element is the number of protons present in the
nucleus of the atom of the element.
All the atoms of an element have the same atomic number.
Eg :- Hydrogen – Atomic number = 1 (1 proton)
Helium - Atomic number = 2 (2 protons)
Lithium - Atomic number = 3 (3 protons)
b) Mass number (A) :-
The mass number of an element is the sum of the number of protons and
neutrons (nucleons) present in the nucleus of an atom of the element.
The mass of an atom is mainly the mass of the protons and neutrons in the
nucleus of the atom.
Eg :- Carbon – Mass number = 12 (6 protons + 6 neutrons) Mass = 12u
Aluminium – Mass number = 27 (13 protons + 14 neutrons) Mass = 27u
Sulphur – Mass number = 32 (16 protons + 16 neutrons) Mass = 32u
In the notation of an atom the Mass number
atomic number and mass number Eg :- N
are written as :- Atomic number
Symbol of
element
14
7
14. 5) Isotopes :-
Isotopes are atoms of the same element having the
same atomic numbers but different mass numbers.
Eg :- Hydrogen has three isotopes. They are Protium,
Deuterium (D) and Tritium (T).
H H H
Protium Deuterium Tritium
Carbon has two isotopes. They are :-
C C
Chlorine has two isotopes They are :-
Cl Cl
1
1 1 1
2 3
12
6 6
14
35 37
17 17
15. 6) Isobars :-
Isobars are atoms of different elements having different
atomic numbers but same mass numbers.
These pairs of elements have the same number of
nucleons.
Eg :- Calcium (Ca) – atomic number - 20 and Argon (Ar)
– atomic number 18 have different atomic numbers but
have the same mass numbers – 40.
Iron (Fe) and Nickel (Ni) have different atomic
numbers but have the same atomic mass numbers – 58.
20 18
40 40
58 58
27
26
Fe
Ca Ar
Ni