Q2 of 75 Page 81

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

Helium and neon exist as independent atoms. Mostly elements of noble gases exist as independent forms.


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5

Calculate the number of sodium ions that are present in 212g of sodium carbonate.

 1

Why are Dalton’s symbols not used in chemistry?

 3

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

 4

Give the symbols of the following elements.

(i) Aluminium (ii) Cobalt


(iii) Arsenic (iv) Radon