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Ch. 3 Elements and
the periodic table lessons 1-4
| Word | Definition |
|---|---|
| atom | The basic particle from which all elements are made; the smallest particle of an element that has the properties of that element |
| electron | A tiny, negatively charged particle that moves around the outside of the nucleus of an atom. |
| nucleus | The central core of an atom which contains proton and neutrons. |
| proton | Small, positively charged particles that are found in the nucleus of an atom. |
| energy level | A region of an atom in which electrons of the same energy are likely to be found. |
| neutron | A small particle in the nucleus of the atom, with no electrical charge. |
| atomic number | The number of protons in the nucleus of an atom. |
| isotope | An atom with the same number of protons and a different number neutrons from other atoms of the same element |
| mass number | The sum of protons and neutrons in the nucleus of an atom |
| atomic mass | The average mass of all the isotopes of an element. |
| periodic table | An arrangement of the elements showing the repeating pattern of their properties. |
| chemical symbol | A one- or two-letter representation of an element. |
| period | A period |
| group | |
| metal | |
| luster | |
| malleable | |
| ductile | |
| thermal conductivity | |
| electrical conductivity | |
| reactivity | |
| corrosion | |
| alkali metal | |
| alkaline earth metal | |
| transition metal | |
| nonmetal | |
| diatomic molecule | |
| halogen | |
| noble gas | |
| metalloid | |
| semiconductor |
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abelan001