Question

an element belongs to the period 2 it has 7 electrons in its outermost shell identify the element ​

Answer 1

The element which belongs to the period 2 and it has 7 electrons in its outermost shell is Fluorine (F)

- The atomic no of fluorine is 9

- It belongs to the 2nd period

- It belongs to the 17th group, i.e., Halogen group

- its electronic configuration is 1s²,2s²2p⁵

- So it has 7 electrons in the outermost shell

Answer 2

Given that element belongs to period 2 it has 7 electrons in its outermost shell.

The element is Fluorine  

Electronic configuration : 1s² 2s² 2p⁵

Period = 2

Group = 17 [ halogens]

Valence electrons = 7

Valency = 1

∴ The element  is Fluorine symbol F with atomic number 9