Question

A. Element in Group VIIA, Period 4
1)Br. 2) C. 3) Mn
B. Element in Group IIA, Period 3
1)beryllium. 2) magnesium. 3) boron.​

Answer 1

Explanation:

A )

1) Br

B )

2) magnesium

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Answer 2

Explanation:

A:Mn

B:Magnesium

in 3 period there are 8 elements