Question

3. An atom of an element has 5 electrons in L- shell. (3m)
(i) What is the atomic number of the element?

(ii) State its valency.

(iii) Identify the element and write its name.

4. Give any three applications of Isotopes. (3m)

5. An element M forms the compound MH, when it
reacts with hydrogen .(2m)

i. Find the valency of element M.

ii. Name three isotopes of Hydrogen.

Answer 1

Answer:

hyodrogen is answear mark me BRAINLEST

Answer 2

Answer:

the atomic number is 7

name nitrogen

valency 5

Explanation:

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