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9 July, 03:36

Which statement about atoms of elements in the same group of the periodic table is true?

They have similar chemical properties and the same number of valence electrons. They have the same number of protons and the same mass.

They have the same number of energy levels and the same amount of reactivity. They have the same number of electrons and the same atomic radius size.

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  1. 9 July, 04:10
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    The answer is " They have similar chemical properties and the same number of valence electrons."
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