Q19 of 149 Page 210

What valencies will be shown by the elements A, B, C, D and E having atomic numbers 2, 4, 8, 10, and 13 respectively.

When atomic no. is 2 then the valency shown by A – 0

When atomic no. is 4 then the valency shown by B - 2


When atomic no. is 8 then the valency shown by C - 2


When atomic no. is 10 then the valency shown by D - 0


When atomic no. is 13 then the valency shown by E - 3


More from this chapter

All 149 →
17

Write the electronic configuration of the element with atomic number 17. Indicate the valency of the element.

 18

The atomic number of an element X is 16.

(a) Write down the electronic configuration of X.


(b) What will be the valency of X?

 20

Give one use each of the following radioactive isotopes:

(a) Uranium-235


(b) Cobalt–60

 21

Explain why are not considered isotopes.