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प्रश्न
Match the atomic numbers 4, 14, 8, 15 and 19 with each of the following:
- A solid non-metal of valency 3.
- A gas of valency 2.
- A metal of valency 1.
- A non-metal of valency 4.
उत्तर
| Name with valency | Atomic Number |
| 1. A solid non-metal of valency 3 | 15 |
| 2. A gas of valency 2 | 8 |
| 3. A metal of valency 1 | 19 |
| 4. A non-metal of valency 4 | 14 |
Explanation:
-
As atomic number 15 has an electronic configuration [2, 8, 5], 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 of 3.
-
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.
-
As atomic number 19 has an 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.
-
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.
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