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9U2C2
Periodic Table, Atomic Structure, & Compounds
| Term | Definition |
|---|---|
| elements | one type of atom |
| periodic table | table of all of the elements |
| chemical symbol | one or two letters that represent an element |
| atomic number | the number of protons an atom contains |
| atomic mass | the average mass of a typical atom of that element |
| period | a row of elements across the periodic table |
| group | a column of elements in the periodic table |
| Dmitri Ivanovich Mendeleev | was a Russian scientist, invented the periodic table in 1869 |
| isotopes | atoms of the same element that have a different number of neutrons |
| neutral element | element that has the same number of protons and electrons, no charge |
| ion | a charged atom |
| molecules | two or more atoms combined |
| molecular compound | molecules combined with other molecules |
| diatomic molecule | a molecule containing only two atoms |
| chemical bond | the force that holds two atoms together |
| valance electrons | electrons in the outermost energy level |
Created by:
Ms. Greenup
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