Q4 of 75 Page 81

Give the symbols of the following elements.
(i) Aluminium (ii) Cobalt

(iii) Arsenic (iv) Radon

i. The symbol of aluminium is Al.

ii. The symbol of cobalt is Co.

iii. The symbol of arsenic is As.

iv. The symbol of radon is Rn.

Atoms of most elements are not able to exist independently. Name two atoms which exist as independent atoms.

In which form do atoms exist in aqueous solution? Give example.

What do you understand from the statement “relative atomic mass of sulphur is 32”?

Write the ions present in

(i) Al₂(CO₃)₃ (ii) AlBr₃

Give the symbols of the following elements.(i) Aluminium (ii) Cobalt(iii) Arsenic (iv) Radon