Periods of the periodic table are ____ rows with the same number of ____. Groups in the periodic table are ____ ____ of elements with similar ____. Metal ions have a ____ charge as they ____ electrons. Non-metal ions have a ____ charge as they ____ electrons. The Halogens are ____ that form molecules of two (____ molecules). They are ____ reactive as you go down. The Noble gases are ____ that are very ____. The Alkali metals are ____ that are very ____. Mendeleev improved the periodic table by leaving ____ for elements that had not been ____ yet.

Periodic table

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