Question

Pls answer this question who will answer thus question I will mark him as brainlist​

Answer 1

Answer:

hope so it's correct......

Answer 2

Important point :

a) Valency - Number of electrons a elements can loose or gain

b) Valence electrons - Number of atoms in outer most shell of an element

1) Atomic number = 17

(a) Electronic configuration - 2,8,7

{ Electronic configuration if u r in higher class - 1s² 2s² 2p⁶ 3s² 3p⁵ }

(b) Valency : 1

(c) Valence electrons : 7

(d) Element : Chlorine ( Non metal )

2) Atomic number = 12

(a) Electronic configuration - 2,8,2

{ Electronic configuration if u r in higher class - 1s² 2s² 2p⁶ 3s² }

(b) Valency : 2

(c) Valence electrons : 2

(d) Element : Magnesium ( Metal )

3) Atomic number = 16

(a) Electronic configuration - 2,8,6

{ Electronic configuration if u r in higher class - 1s² 2s² 2p⁶ 3s² 3p⁴ }

(b) Valency : 2

(c) Valence electrons : 6

(d) Element : Oxygen ( Non metal )

4) Atomic number = 20

(a) Electronic configuration - 2,8,8,2

{ Electronic configuration if u r in higher class - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² }

(b) Valency : 2

(c) Valence electrons : 2

(d) Element : Calcium ( Metal )

5) Atomic number = 5

(a) Electronic configuration - 2,3

{ Electronic configuration if u r in higher class - 1s² 2s² 2p¹ }

(b) Valency : 3

(c) Valence electrons : 3

(d) Element : Boron ( Non metal )

6) Atomic number = 13

(a) Electronic configuration - 2,8,3

{ Electronic configuration if u r in higher class - 1s² 2s² 2p⁶ 3s² 3p¹}

(b) Valency : 3

(c) Valence electrons : 3

(d) Element : Aluminium ( Metal )