Question

Write atomic number and valency of the following elements: (i) Nitrogen (ii) Magnesium

Hint:

The atomic number is the number of protons in the nucleus of an atom, and the valency determines how many bonds an element can form with other atoms based on its electron configuration.

Answer 1

(i) Nitrogen:
- Atomic Number: 7
- Valency: 3 (Nitrogen typically forms three bonds as in ammonia, NH₃, or can have a valency of 5 in certain compounds like nitrogen pentachloride, NCl₅).

(ii) Magnesium:
- Atomic Number: 12
- Valency: 2 (Magnesium commonly forms ionic bonds by losing two electrons, as seen in magnesium chloride, MgCl₂).