who invented the periodic table, Dmitri Mendeleev, what is a period, a group of elements that are in a row with increasing atomic numbers, what is a group, a group of elements that are up/down in a column, how many elements are in the periodic table, 118, periodic table, all the chemical elements that have been discovered arranged in rows and columns, how elements change going down a column (group), they all havshare common properties, such as melting point and boiling point, how elements change going across a row (period), the atomic number increases.

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