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10 March, 08:44

What do all elements in a column in the periodic table have in common?

Their atoms have the same number of valence electrons.

Their atoms have the same atomic mass.

Their atoms have the same number of protons and electrons.

Their atoms have the same number of neutrons.

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  1. 10 March, 09:13
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    Their atoms have the same number of valence electrons
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