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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 |