Question

Sodium and chlorine are placed in the third Period of the modern periodic table with group and respectively state their valencies which are them can from Union which of them can from Ketan give reason for your answer

Answer 1

Sodium will form cation as it's valency will be +1 and chlorine will form anion as it s valency is -1

Answer 2

Sodium is a metal belonging to group 1 of the periodic table and has a valency of +1 whereas chlorine is a non-metal belonging to group 17( group-VIIa) of the periodic table with a valency of -1.

Sodium(Na) with atomic number 11 has an electronic configuration of 2,8,1. Therefore in order to reach the octet state( having 8 electrons in its outermost shell), it has to lose one electron from its valence shell, thereby forming a cation.

Chlorine(Cl) with atomic number 17 has an electronic configuration of 2,8,7. Therefore, to reach an octet state, it has to gain one electron, thereby forming an anion.