Question

Give the symbol of a. Proton b. Neutron c. Electron d. Argon (mass no. =40, atomic no. =18) e. Potassium (mass no. =39, atomic no. =19) 3. Write down the minimum no. of electrons, can be​

Answer 1

Solution:

Element A

Atomic number =7= Number of electrons =2,5

Valency of A=8−5=3

Element B

electronic configuration =2,8,8

Valency of B=zero

Element C has 13 electrons

electronic configuration =2,8,3

Valency of C=3

Element D 

Protons =18= Electrons =2,8,8

Valency of D=Zero

Element E 

electronic configuration =2,8,8,1

Valency of E=1