A horizontal row on the periodic table is a

How many periods are there on the periodic table?

The period number tells

The first energy level is filled with ___ electrons; the others are stable with____.

A group or family is

All elements in a group or family have similar chemical properties because

An elements valence number is equal to

Starting at the left side of the periodic table and moving right, you'd pass through

If you wanted to know the number of protons in lithium you would

The number of occupied energy levels for an element equals

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