Question

WHICH ELEMENTS OF THE PERIODIC TABLE ARE THIS ONES
A- electronic configuration 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1
B- pit takes part of the second period, group III A.
C- Z = 54
D- electronic configuration 1s 2 2s 2 2p 6 3s 2 3p 5
E- it is an alkaline earth of the fourth period.

Answer 1

A. k(patasium)

B.

C. Cb

D. Cl(cholron)

E. kr

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