460 BC - Greek philosopher proposes the existence of the atom
He pounded materials until he made them into smaller and smaller parts
He called them atoma which is Greek for “indivisible”.
460 BC - Greek philosopher proposes the existence of the atom
He pounded materials until he made them into smaller and smaller parts
He called them atoma which is Greek for “indivisible”.
CHEMICAL REACTION
CHEMICAL EQUATION
CHEMICAL FORMULA
BALANCING
TYPES OF CHEMICAL REACTION
COLLISION THEORY
FACTORS AFFECTING THE RATE OF CHEMICAL REACTION
Chemists have always looked for ways of arranging the elements to reflect the similarities between their properties. The modern periodic table lists the elements in order of increasing atomic number (the number of protons in the nucleus of an atom). Historically, however, relative atomic masses were used by scientists trying to organise the elements. This was mainly because the idea of atoms being made up of smaller sub-atomic particles (protons, neutrons and electrons) had not been developed. Nevertheless, the basis of the modern periodic table was well established and even used to predict the
Periodic Table of SEO Success Factors & Guide to SEO by SearchEngineLandSearch Engine Land
Updated in July 2013, SearchEngineLand.com's Periodic Table of SEO Success Factors is explained in a quick-start presentation format. Read the companion Guide to SEO, featuring nine chapters that explain the Periodic Table of SEO elements in more detail, perfect to use a beginner's guide and tutorial for getting started with search engine optimization.
The Periodic Table of SEO Success Factors
http://searchengineland.com/seotable
Read the Search Engine Land Guide to SEO:
http://searchengineland.com/guide/seo
Chapter 1: Types Of Search Engine Success Factors
http://searchengineland.com/guide/seo/types-of-search-engine-ranking-factors
Chapter 2: Content & Search Engine Success Factors
http://searchengineland.com/guide/seo/content-search-engine-ranking
Chapter 3: HTML Code & Search Engine Success Factors
http://searchengineland.com/guide/seo/html-code-search-engine-ranking
Chapter 4: Site Architecture & Search Engine Success Factors
http://searchengineland.com/guide/seo/site-architecture-search-engine-ranking
Chapter 5: Link Building & Ranking In Search Engines
http://searchengineland.com/guide/seo/link-building-ranking-search-engines
Chapter 6: Social Media & Ranking In Search Results
http://searchengineland.com/guide/seo/social-media-ranking-search-results
Chapter 7: Trust, Authority, Identity & Search Rankings
http://searchengineland.com/guide/seo/trust-authority-search-rankings
Chapter 8: Personalization & Search Engine Rankings
http://searchengineland.com/guide/seo/personalization-search-engine-rankings
Chapter 9: Violations & Search Engine Spam Penalties
http://searchengineland.com/guide/seo/violations-search-engine-spam-penalties
CHEMICAL REACTION
CHEMICAL EQUATION
CHEMICAL FORMULA
BALANCING
TYPES OF CHEMICAL REACTION
COLLISION THEORY
FACTORS AFFECTING THE RATE OF CHEMICAL REACTION
Chemists have always looked for ways of arranging the elements to reflect the similarities between their properties. The modern periodic table lists the elements in order of increasing atomic number (the number of protons in the nucleus of an atom). Historically, however, relative atomic masses were used by scientists trying to organise the elements. This was mainly because the idea of atoms being made up of smaller sub-atomic particles (protons, neutrons and electrons) had not been developed. Nevertheless, the basis of the modern periodic table was well established and even used to predict the
Periodic Table of SEO Success Factors & Guide to SEO by SearchEngineLandSearch Engine Land
Updated in July 2013, SearchEngineLand.com's Periodic Table of SEO Success Factors is explained in a quick-start presentation format. Read the companion Guide to SEO, featuring nine chapters that explain the Periodic Table of SEO elements in more detail, perfect to use a beginner's guide and tutorial for getting started with search engine optimization.
The Periodic Table of SEO Success Factors
http://searchengineland.com/seotable
Read the Search Engine Land Guide to SEO:
http://searchengineland.com/guide/seo
Chapter 1: Types Of Search Engine Success Factors
http://searchengineland.com/guide/seo/types-of-search-engine-ranking-factors
Chapter 2: Content & Search Engine Success Factors
http://searchengineland.com/guide/seo/content-search-engine-ranking
Chapter 3: HTML Code & Search Engine Success Factors
http://searchengineland.com/guide/seo/html-code-search-engine-ranking
Chapter 4: Site Architecture & Search Engine Success Factors
http://searchengineland.com/guide/seo/site-architecture-search-engine-ranking
Chapter 5: Link Building & Ranking In Search Engines
http://searchengineland.com/guide/seo/link-building-ranking-search-engines
Chapter 6: Social Media & Ranking In Search Results
http://searchengineland.com/guide/seo/social-media-ranking-search-results
Chapter 7: Trust, Authority, Identity & Search Rankings
http://searchengineland.com/guide/seo/trust-authority-search-rankings
Chapter 8: Personalization & Search Engine Rankings
http://searchengineland.com/guide/seo/personalization-search-engine-rankings
Chapter 9: Violations & Search Engine Spam Penalties
http://searchengineland.com/guide/seo/violations-search-engine-spam-penalties
Historical development of periodic tableVeenuGupta8
THIS PRESENTATION IS BASED ON THE CONTRIBUTION OF DIFFERENT CHEMIST IN CREATING THE PERIODIC TABLE .IT WILL HELP THE LEARN THE VARIOUS MERITS AND DEMERITS OF VARIOUS METHODS OF CLASSIFYING ELEMENTS
Inspired by a missed train and a dream, Mendeleev devised a comprehensive way to classify the elements.
Register to explore the whole course here: https://school.bighistoryproject.com/bhplive?WT.mc_id=Slideshare12202017
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
2. During the nineteenth century, chemists began to categorize the elements according to similarities in their physical and chemical properties. The end result of these studies was our modern periodic table.
3. Johann Dobereiner 1780 - 1849 Model of triads In 1829, he classified some elements into groups of three, which he called triads. The elements in a triad had similar chemical properties and orderly physical properties. (ex. Cl, Br, I and Ca, Sr, Ba)
4. John Newlands 1838 - 1898 Law of Octaves In 1863, he suggested that elements be arranged in “octaves” because he noticed (after arranging the elements in order of increasing atomic mass) that certain properties repeated every 8th element.
5. John Newlands 1838 - 1898 Law of Octaves Newlands' claim to see a repeating pattern was met with savage ridicule on its announcement. His classification of the elements, he was told, was as arbitrary as putting them in alphabetical order and his paper was rejected for publication by the Chemical Society.
6. John Newlands 1838 - 1898 Law of Octaves His law of octaves failed beyond the element calcium. WHY? Would his law of octaves work today with the first 20 elements?
7. Dmitri Mendeleev 1834 - 1907 In 1869 he published a table of the elements organized by increasing atomic mass.
8. Lothar Meyer 1830 - 1895 At the same time, he published his own table of the elements organized by increasing atomic mass.
12. After the discovery of these unknown elements between 1874 and 1885, and the fact that Mendeleev’s predictions for Sc, Ga, and Ge were amazingly close to the actual values, his table was generally accepted.
13. However, in spite of Mendeleev’s great achievement, problems arose when new elements were discovered and more accurate atomic weights determined. By looking at our modern periodic table, can you identify what problems might have caused chemists a headache? Ar and K Co and Ni Te and I Th and Pa
14. Henry Moseley 1887 - 1915 In 1913, through his work with X-rays, he determined the actual nuclear charge (atomic number) of the elements*. He rearranged the elements in order of increasing atomic number. *“There is in the atom a fundamental quantity which increases by regular steps as we pass from each element to the next. This quantity can only be the charge on the central positive nucleus.”
15. Henry Moseley His research was halted when the British government sent him to serve as a foot soldier in WWI. He was killed in the fighting in Gallipoli by a sniper’s bullet, at the age of 28. Because of this loss, the British government later restricted its scientists to noncombatant duties during WWII.
16. Glenn T. Seaborg After co-discovering 10 new elements, in 1944 he moved 14 elements out of the main body of the periodic table to their current location below the Lanthanide series. These became known as the Actinide series. 1912 - 1999
17. Glenn T. Seaborg He is the only person to have an element named after him while still alive. 1912 - 1999 "This is the greatest honor ever bestowed upon me - even better, I think, than winning the Nobel Prize."
20. The vertical columns of the periodic table are called GROUPS, or FAMILIES. The elements in any group of the periodic table have similar physical and chemical properties!
21. Periodic Law When elements are arranged in order of increasing atomic number, there is a periodic pattern in their physical and chemical properties.