Ela Chowdary Solutions for Chapter: Atomic Structure, Exercise 4: EVALUATION

Write the formulae and the valencies of the following radicals.

Ammonium, Nitrate, Chloride, Sulphate, Hydroxide, Phosphate, Sulphide

Name the following compounds.

${\mathrm{CH}}_4, \mathrm{NaCl}, \mathrm{NaOH}, {\mathrm{CaCO}}_3, {\mathrm{Na}}_2{\mathrm{SO}}_4, {\mathrm{CO}}_2, {\mathrm{SiO}}_2, {\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6, {\mathrm{NH}}_3$

Distinguish between a molecule of an element and a molecule of a compound.

Define atomicity. Write the atomicity of hydrogen, ozone and sulphur.

Define valency of an element. Write the valencies of sodium, chromium, zinc and iron.

What are radicals? Give two examples.

Define an atom and a molecule. Write two differences between them.

What are the three subatomic particles of an atom? How are they different from each other?