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For groups 1 and 2, the number of valence electrons is _______________________________For groups 13-18, the number of valence electrons is _________________________
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- Mass Number, what does it add up?A) Amount of neutrons and electronsB) Amount of protons and electronsC) Amount of protons and neutrons
- arranged by increasing atomic number, metals on the left, nonmetals on the right, metalloids are the stair steps between, Elements are arranged because they have similar properties (same number of valance electrons)
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