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Atom Works
Words and Definitions
| Word | Definition |
|---|---|
| Element | a pure substance that cannot be separated or broken down into simpler substances by physical or chemical bonds |
| Compound | a pure substacne composed of two or more elements that are chemically combined |
| Mixture | a combination of two or more substances that are not chemically combined |
| Atom | the smallest particle into which an element can be divided and still retain all of the properties of that element |
| Proton | the positively charged particles of the nuclews; the number of protons in a nucleus is the atomic number, which determines the identity of an element |
| Electron | the negatively charged particles found in all atoms; electrons are involved in the formation of chemical bonds |
| Neutron | the particles of the nucleus that have no charge |
| Periodic | having a regular, repeating pattern |
| Periodic Law | a law that states that the chemical and physical properties of elements are periodic functions of their atomic numbers |
| Atomic Number | the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element |
| Atomic Mass | the weighted average of the masses of all the naturally occurring isotopes of an element |
| Isotope | atoms that have the same number of protons but have different numbers of neutrons |
| Valance Electron | the electrons in the outermost energy level of an atom; these electrons are involved in forming chemical bonds |
| John Dalton | Atomic Theory |
| J.J. Thomson | Small particles in atom |
| Ernest Rutherford | positive charged nucleus, atom mostly empty space electrons travel around nucleus |
| Niels Bohr | electrons travel in clouds |
| Dmocritus | 1st to come up with idea of atom |
| Dmitri Mendeleev | Father of Periodic Table, arrange elements by atomic mass |
| Henry Moseley | Rearranged Periodic Table by atomic number |
Created by:
pinoymonkey
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