Question

Atomic number of aluminium is 13 and mass number is 27. calculate the number of electrons, protons and neutrons in the ion formed. represent the ion. what will be its valency ? (3)

Answer 1

Number of electrons =number of protons =13
Number of neutrons =mass number - atomic number =27-13=14

Answer 2

Explanation:

Aluminium has valency 3.

before the formation of ion ,it has

electrons =13

protons = 13

neutrons =14

after the ion formation ,it looses 3 electrons

so, electrons = 13-3 = 10

protons =13

neutrons =14.