Question

Find A, B, C, D elements belongs to which blocks. Atomic numbers of elements A-12, B-21, C-18, D-30​

Answer 1

Answer:

Let us take a look at the electronic configurations of the given elements,

A: (2, 7)

B: (2, 8, 1)

C: (2, 8, 7)

D: (2, 8, 2)

E: (2, 8, 3)

We can see that elements A and C both have 7 valence electrons. Thus, both the elements belong to the same group.

So, the correct option is C

Answer 2

Answer:

A is magnesium it belongs to s block as it is

B is scandium it belongs to d block

C is argon and it belongs to p block

D is zinc and it belongs to d block