subatomic particles
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Protons, neutrons, and electrons are the three main subatomic particles. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. The atomic number identifies the number of protons in an atom's nucleus, while atomic mass refers to the total number of protons and neutrons.
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Atom inside out
This document provides an overview of the history and development of the atomic theory. It discusses early Greek philosophers like Democritus who proposed that all matter is composed of indivisible atoms. Later, scientists like John Dalton developed atomic theory further by proposing that atoms are tiny, indivisible particles that combine to form all substances. The document then outlines evidence for subatomic particles like J.J. Thomson's discovery of electrons and Rutherford's discovery of the nucleus. It defines key subatomic particles like protons, neutrons, and electrons and how they combine to form different atoms and isotopes.
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Atoms are the basic building blocks of all matter. John Dalton proposed that atoms are indivisible and identical for each element. Rutherford discovered that atoms have a small, dense nucleus at the center surrounded by electrons. Niels Bohr modeled atoms with electrons orbiting the nucleus in fixed energy levels or shells. The nucleus contains protons and neutrons, while electrons orbit outside. The number of protons determines the element, and protons and neutrons together equal the mass number.
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Atomic models have evolved over time as scientists have learned more about the structure of atoms. Early models proposed atoms as indivisible particles (Democritus, Dalton), while later models depicted atoms as containing smaller particles like electrons (Thomson's plum pudding model). Rutherford determined atoms have a small, dense nucleus at the center with electrons in orbit around it. Bohr refined this by proposing electrons orbit in specific energy levels. Modern atomic theory is based on wave mechanics and depicts electrons as probabilistic distributions rather than definite orbits.
Grade 8 Chemistry Structure of Matter : Atoms, Molecules and Ions
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The document summarizes key information about atomic structure:
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HISTORY OF ATOMIC THEORY
John Dalton proposed the atomic theory in 1804, stating that all matter is composed of tiny, indivisible particles called atoms that cannot be divided further. Later discoveries found that atoms consist of even smaller subatomic particles, including electrons discovered by J.J. Thomson in 1897 and the nucleus discovered by Ernest Rutherford in 1910. The quantum mechanical model developed in 1926 by Schrodinger, Heisenberg and others proposed that electrons exist as waves of energy around the nucleus, rather than following fixed orbits as proposed by Niels Bohr's 1913 planetary model of the atom.
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The document summarizes the development of atomic models over time from Dalton's model to the current quantum mechanical model. Dalton imagined atoms as spheres that differed in size and mass. Thomson discovered the electron and proposed the "plum pudding" model. Rutherford's gold foil experiment revealed the tiny, dense nucleus. Chadwick discovered neutrons in the nucleus. Bohr incorporated electron shells. The current quantum model depicts electrons as clouds surrounding the nucleus.
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John Dalton proposed the atomic theory in 1804, stating that all matter is composed of tiny, indivisible particles called atoms that cannot be divided further. Later discoveries found that atoms consist of even smaller subatomic particles, including electrons discovered by J.J. Thomson in 1897 and the nucleus discovered by Ernest Rutherford in 1910. The quantum mechanical model developed in 1926 by Schrodinger, Heisenberg and others proposed that electrons exist as waves of energy around the nucleus, rather than following fixed orbits as proposed by Niels Bohr's 1913 planetary model of the atom.
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The document summarizes several atomic models proposed by scientists like Dalton, Rutherford, Bohr, Thompson, and Schrodinger. It also discusses physical properties and changes like density, melting/boiling points, and state changes. Chemical properties and changes involving combustion, corrosion, and neutralization are covered. Key physical processes like distillation, evaporation, filtration are explained. Electrolysis and uses are summarized as a chemical process, along with combustion and corrosion.
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This document provides a lesson plan for teaching 3rd and 4th grade students about atoms and matter through making slime. The plan involves introducing the concepts of atoms, the three states of matter, and chemical bonding. Students then make predictions about what will happen when borax, glue and water are mixed and observe the chemical reaction that creates slime. Finally, the lesson reinforces the concepts by discussing the properties of slime and whether it behaves more like a solid or liquid.
Atomic Theory
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The document summarizes different atomic models including Thomson's model, Bohr's model, Sommerfeld's model, and the vector atom model. Thomson's model proposed that atoms are made up of positive charges and distributed negative charges. Bohr's model introduced allowed orbits and quantized angular momentum. Sommerfeld's model accounted for elliptical orbits and relativistic effects. The vector atom model explained phenomena like the Zeeman and Stark effects using quantum numbers for orbital and spin angular momentum.
Atomic structure ppt
The document traces the development of atomic theory from ancient Greek philosophers to modern physics. Democritus first proposed that matter is made of indivisible "atoms" around 400 BC. In the early 1800s, John Dalton provided experimental evidence supporting atoms and proposed that atoms of different elements have different properties. In the late 1800s and early 1900s, experiments by J.J. Thomson, Ernest Rutherford, and Niels Bohr led to discoveries of the electron and development of the nuclear model of the atom. Today's atomic model is based on quantum mechanics and depicts electrons as existing in electron clouds or energy levels rather than definite orbits.
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The document discusses various health-related fitness tests that measure components of physical fitness. It describes tests for cardiorespiratory endurance like the beep test and 1-km run/walk. It also covers flexibility tests like the sit-and-reach, as well as definitions and calculations for body mass index (BMI). Safety procedures are outlined for correctly administering and participating in the fitness tests.
Instrumental Groups on the Lowlands in Luzon
This document discusses various traditional instrumental groups from the lowlands of Luzon, Philippines. It describes the Rondalla ensemble of string instruments, noting key instruments like the banduria, laud, octavina, and guitar. It also outlines the brass band, identifying instruments such as the trumpet, trombone, French horn, tuba, euphonium, flute, clarinet, piccolo, saxophone, cymbals, bass drum, snare drum. Additionally, it provides details about the Pangkat Kawayan bamboo ensemble and their instruments including the bumbong, kalatok, talunggating, angklung, kalagong, and panpipes. The Musik
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Slang is a type of informal language used in conversations by specific groups of people to distinguish it from other nonstandard language forms. The document provides examples of common slang words and their meanings, including acronyms like ROFL, STFU, LMK, ILY, TBT, YOLO, SMH, LMFAO, NVM, and ICYMI. It also lists some slang terms for objects and emotions.
Tone and Mood
The document provides examples of tone and mood in writing passages. It defines tone as the author's attitude toward the subject, and mood as the emotion or feeling conveyed to the reader. Several terms are listed that describe different tones and moods. The passages that follow demonstrate varying tones such as serious, playful, and reassuring, as well as moods like exciting, silly, and fearful.
Exploring and Maintaining Your Computer pt. 1
This document provides instructions for using and maintaining basic computer functions. It discusses the taskbar and how to hide it. It describes using the search feature and what is contained in the system tray, such as the speaker, battery, and brightness icons. The document outlines how to use File Explorer to rename, delete, and restore files and folders, including using the Recycle Bin. It also explains how to copy, move, and paste files between locations. Finally, it defines what programs are and mentions different types like freeware and licensed software.
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1) The document discusses different types of traditional textiles from the Philippine Highlands and Lowlands regions. In the Highlands, textiles include ikat from Ifugao with diamond and stripe patterns, kadangyan burial cloth, gilamat ka-in skirts featuring symbols of nature and fertility, and ginamat loincloths or wanes and lufid wraps made in colors representing tribes. In the Lowlands, notable textiles are inabel blankets from Ilocos, piña made from pineapple leaves, jusi with a tighter weave than piña, banaca fabric popularized by Dita Sandico Ong, and abaca from Bicol.
2) The document provides information
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This document appears to be a presentation on physical fitness and its components. It defines physical activity, exercise, and physical fitness. It then discusses the health-related components of fitness, including cardiorespiratory endurance, muscular endurance, muscular strength, body composition, and flexibility. It also covers the skill-related components: agility, balance, coordination, power, reaction time, and speed. Examples or descriptions are provided for each component. The presentation concludes with a quiz to test the audience's understanding of the different components.
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EXPLORING THE MS WINDOWS ENVIRONMENT
This document provides an overview of the history and features of the Microsoft Windows operating system. It discusses:
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Research Reflection Topic: Listening Difficulties of Students
The document discusses a study on listening difficulties faced by students. It analyzes data from a questionnaire given to 50 English major students. The main findings were:
1) Students spend little time practicing listening on their own, hindering improvement.
2) When encountering unknown words, most students try guessing the meaning instead of ignoring it and continuing to listen.
3) Students listen word-for-word instead of focusing on key ideas, making comprehension difficult. The study provides recommendations to help students strengthen their listening skills.
Teaching approaches
This document discusses different teaching approaches including constructivism, cooperative learning, inquiry-based learning, and contextualized learning. Constructivism holds that people build knowledge through experiences and interactions. Cooperative learning involves students working together to solve problems or tasks in small groups. Inquiry-based learning has students construct their own knowledge through experiences rather than being passive receivers of information from the teacher. Contextualized learning places learning in real-world contexts to make it more meaningful and engaging for students.
Exact and Emphatic Words / Improrieties
This document provides examples of intensifiers and their meanings as well as examples of how they are used in sentences. It also discusses homonyms and homophones, defining them as words that have the same pronunciation but different meanings or spellings. Examples of perfect homonyms, homophones, and homographs are given to illustrate the concepts.
giving opinion facts
The document defines facts as statements that can be proven true through evidence, while opinions are personal judgments or beliefs that cannot be proven. It provides examples of facts like "Monkeys are mammals" and opinions like "She is the coolest girl in school." The document emphasizes that distinguishing facts from opinions allows one to better evaluate information.
making predictions
This document discusses how to make predictions in English using the future tense. There are two main ways to make predictions: using "will" to talk about the simple future, or using "going to" to make general predictions or predictions based on current evidence. It provides examples of correct and incorrect usage of these tenses when making predictions about events like arrivals, matches, and the weather. Making accurate predictions in English requires understanding when to use "will" versus "going to".
making generalizations
Generalizations are rules or statements that apply to many situations or events. Generalizations commonly contain signal words such as in general, usually, often, few, some, tend to, or most. They make broad statements about multiple situations rather than focusing on specifics.
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subatomic particles
- 2. SUBATOMIC PARTICLES Particles that are smaller than atom.
- 3. ThreeMainSubatomicParticles Protons Neutrons Electrons
- 4. PROTONS AND NEUTRONS All protons are identical to each other, and all neurons are identical to each other. Protons have a positive charge (+). Neutrons have no electrical charge.
- 6. ISOTOPES Atom of the same element that have the same number of protons but different number of neutrons.
- 8. ELECTRONS Have negative charge (-). They are moving so fast and the path that they travel is not the same each time.
- 11. THEEND