Question

Question #55b04

Answer 1

Please read below;

Explanation:

The element is selenium `(Se)`

It has atomic number of `34`

Its electronic configuration is `[Ar] 3d^10 4s^2 4p^4 or 4s^2 3d^10 4s^2 4p^4`

Electron per shell is `2,8,18,6`

Therefore, It need to gain two electrons `(2e^-)` to attain the octet structure or be stable..

Answer 2

`"The element is located in Period 4 and in Group 16"` `"and it is identified as Selenium(Se)".` `"This element will gain 2 more electrons to achieve stability."`

Explanation:

The highest energy level is 4 which means that the element is located in `"Period " 4` and that the valence electron is 6; that is, `2e^-` in the `s " sublevel"` and `4e^-` in `p " sublevel"`. which means that the element is in `"Group " 16`

Using the periodic table, this element is identified as `"Selenium" (Se)`

Since the element is a nonmetal; the tendency is to gain `2e^-` to complete an octet and achieve stability.