Question

PLEASE ANSWER THE ATTACHMENT​

Answer 1

The atomic number of this element is 12 . It belongs to Il group and period. The resemble element is Be.

Explanation:

Given that,

The configuration = 2,8,2

(a). The atomic number of this element

The electronic configuration = 2,8,2

2,8,2 = 1s², 2s²2p6, 3s²

This element is Mg.

Therefore, The atomic number of this element is 12.

(b). The group of this element is second group because the last electron enters to s block.

Thus it is a s block element. For s block elements the group no is equal to the no of electrons the valence shell contains

(c). The element belongs to 3rd period because the last electron enters into the third energy level.

(d). Be is the resemble element of this element because the last electron is same in the electronic configuration.

The electronic configuration of Mg =

2,8,2

The electronic configuration of Be = 2,2

Hence, The atomic number of this element is 12. It belongs to Il group and 3 period. The resemble element is Be.

Answer 2

Explanation:

a) be is the resemble element of this element because the last electron is same in the electronic configuration. Hence, The atomic number of this element is 12 . It belongs to II group and 3 period.

b) This element is Mg. Therefore, The atomic number of this element is 12. (b). The group of this element is second group because the last electron enters to s block.

c) Be is the resemble element of this element because the last electron is same in the electronic configuration. Hence, The atomic number of this element is 12 . It belongs to II group and 3 period

d) The element belongs to 3rd period because the last electron enters into the third energy level. (d). Be is the resemble element of this element because the last electron is same in the electronic configuration. Hence, The atomic number of this element is 12 .