Question

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Answer 1

answer

a. N(7) ,B(4) ,Ar(18) ,CL(7)

b.N(15 group)

Be(2 group)

Ar(18 group)

CL (17 group)

c.N and Be (2 period)

Ar and CL (3 period)

d.I didn't know

Answer 2

Answer:

a. Electronic configuration of this element (2,8,2) .

The number of element is 12.

b. Group 2

c. Period 3

d. Be

Explanation:

Hope this helps you....