ICSE Class 9 Chemistry
Question 9 of 39
Atomic Structure and Chemical Bonding — Question 17
Back to all questions| Property | Atomic Number |
|---|---|
| A solid non-metal of valency 3 | 15 |
| A gas of valency 2 | 8 |
| A metal of valency 1 | 19 |
| A non-metal of valency 4 | 14 |
(a) As atomic number 15 has electronic configuration [2,8,5], so it is a non-metal having 5 electrons in the valence shell and needs three electrons to complete its octet so it has a valency 3.
(b) As atomic number is 8, so it has the electronic configuration of [2,6] and it needs 2 electrons to complete its octet hence, it is a gas of valency 2
(c) As atomic number 19 has electronic configuration [2,8,8,1], so it is a metal having 1 electron in the valence shell and donates its one electron to complete its octet so it has a valency 1.
(d) As atomic number 14 has electronic configuration [2,8,4], so it is a non-metal having 4 electrons in the valence shell and needs four electrons to complete its octet so it has a valency 4.