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Atomic Theory - chemmybear.com
Atomic Theory - chemmybear.com

t7_photoel
t7_photoel

... PHOTOELECTIC EFFECT PARTICLE MODEL OF LIGHT PHOTOELECTRIC EFFECT EMR falling on a metal surface can eject electrons (photocurrent) Hert’z experiments – speed of radio waves (same as light) 1886-7 Hertz’s observation of the effect of a radio wave on a receiver – photoelectric effect - UV can cause el ...
Chapter 3 Atomic Structure
Chapter 3 Atomic Structure

Chemical Reaction Basics
Chemical Reaction Basics

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3 - Zheng Research Group

... Heterogeneous mixture (more than 1 phase) ...
Atoms Matter Energy Notes
Atoms Matter Energy Notes

... o Recognized patterns based on physical and chemical properties of the elements that have been discovered o Also included:  atomic mass: average mass of an atom o The periodic table is organized by physical properties. Element: a substance that cannot be broken down into smaller substances by ordin ...
Core Idea PS1 Matter and Its Interactions How can one explain the
Core Idea PS1 Matter and Its Interactions How can one explain the

... electrical  forces  (within  and  between  atoms)   stable  forms  of  matter   electric  field  energy   magnetic  field  energy   stable  molecule  (  has  less  energy,  by  an  amount  known  as  the  binding  energy,   than  the  s ...
File
File

Lecture 9
Lecture 9

... diffraction glasses. They work just like a prism and break up light into its components. Notice the dark spots between the “lines” of the different colors. The number and positions of the lines are the unique signature of the elements. A lab experiment. Note the number and color of the lines. See if ...
Lecture_19-Energy Levels in the Bohr model of the atom
Lecture_19-Energy Levels in the Bohr model of the atom

... • Niels Bohr explained atomic line spectra and the stability of atoms by postulating that atoms can only be in certain discrete energy levels. When an atom makes a transition from one energy level to a lower level, it emits a photon whose energy equals that lost by the atom. • An atom can also absor ...
Unit 11: The Mole
Unit 11: The Mole

... MOLAR MASS The molar mass of an element is the mass in grams of one mole of any pure substance. ...
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Nuclear Chemistry

... An isotope has the same atomic number but different mass number Isotopic notation Mass # ...
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Modern Physics TEST

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...  It warms Earth’s interior, is in the air we breathe, and is present in all rocks (some in trace amounts).  It is natural. ...
Document
Document

Interaction of Photons with Matter - Faculty
Interaction of Photons with Matter - Faculty

Gen Chem Ch 5 notes
Gen Chem Ch 5 notes

... The Atom and Unanswered Questions • Recall that in Rutherford's model, the atom’s mass is concentrated in the nucleus and electrons move around it. • The model doesn’t explain how the electrons were arranged around the nucleus. • The model doesn’t explain why negatively charged electrons aren’t pul ...
Chapter 40
Chapter 40

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Preprint

... Besides pursuing novel cooling schemes to reach lower temperatures, there are at least three possibilities to raise the phase transition temperature. (1) Use light atoms (lithium) which tunnel faster due to their smaller mass. (2) Use stronger coupling than second-order tunneling in the form of elec ...
Chemistry - Solutions
Chemistry - Solutions

... • React one H2 with one O2 by splitting the molecules and joining one O atom to two H atoms. Because there is unreacted O, you must react it with another H2 to form another water molecule. – Summarize what happened ___H2 + ___O2  ___H2O ...
Chem Final Study Guide Energy How much heat energy must be
Chem Final Study Guide Energy How much heat energy must be

... properties with both metals and nonmetals. 50) Looking at the periodic table, list 4 atomic numbers that represent elements with similar chemical properties. Why did you choose those numbers? a) Any 4 numbers within the same family/group. Ex: 4, 20, 38, 56 Chemical Reactions 51) Predict the products ...
Problem Set 9 - MIT OpenCourseWare
Problem Set 9 - MIT OpenCourseWare

Inertia and E = Mc2
Inertia and E = Mc2

Name
Name

... Numbered outward from the nucleus, each energy level is assigned a principal quantum number, n, which is also the number of sublevels. Each energy sublevel differs in shape and orientation and contains orbitals, each of which can contain up to two electrons. Each energy level contains a maximum of 2 ...
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Atomic theory



In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. It began as a philosophical concept in ancient Greece and entered the scientific mainstream in the early 19th century when discoveries in the field of chemistry showed that matter did indeed behave as if it were made up of atoms.The word atom comes from the Ancient Greek adjective atomos, meaning ""uncuttable"". 19th century chemists began using the term in connection with the growing number of irreducible chemical elements. While seemingly apropos, around the turn of the 20th century, through various experiments with electromagnetism and radioactivity, physicists discovered that the so-called ""uncuttable atom"" was actually a conglomerate of various subatomic particles (chiefly, electrons, protons and neutrons) which can exist separately from each other. In fact, in certain extreme environments, such as neutron stars, extreme temperature and pressure prevents atoms from existing at all. Since atoms were found to be divisible, physicists later invented the term ""elementary particles"" to describe the ""uncuttable"", though not indestructible, parts of an atom. The field of science which studies subatomic particles is particle physics, and it is in this field that physicists hope to discover the true fundamental nature of matter.
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