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I need help on number 1 please

I need help on number 1 please
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4 votes
I need help on number 1 please

I need help on number 1 please-example-1
User Humayon Zafar
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1 Answer

3 votes

Answer:

Atom 1 and Atom 4 of the elements below are in the same group in the periodic table.

User Jimmygchen
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