Question

Elements A, B and C have atomic numbers 17, 19 and 10 respectively.
State which one is:
(i) A non-metal
(ii) A metal
(iii) Chemically inert?
(iv) Write down the formula of the compound formed by two of the above
elements.

Answer 1

Answer:

i) A

ii) B

iii)C

iv)AB

Explanation:

You can check out the valency to do such kinds of answer with ease.

For e.g. we take chlorine it has atomic no.17

Electronic configuration: 2,8,7

last no. is 7 its a non metal