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period table
Term | Definition |
---|---|
Dmitri Mendeleev | he formulated the Periodic law |
Period | one of the horizontal rows in the periodic table |
family | In chemistry a group (also know as a family) is a column of elements in the periodic table of chemical elements |
Valence electron | an electron associated with atom and a chemical bond |
Electron shells | the out side part of a nucleus |
element | per atom |
Atomic | the number of protons and electrons |