Question

If the mass of a single atom of an element is $5.31\times {10}^{-23}$ g, then which amongst the following elements could it be?

• A. Oxygen
• B. Potassium
• C. Sulphur
• D. Nitrogen

Answer 1

The correct option is C Sulphur

Let the element be X.
Now, 1 atom of element X have mass = $5.31\times {10}^{-23}$ g

So, $6.023\times {10}^{23}$ atoms of elements X have a mass
= $5.31\times {10}^{-23}\times 6.023\times {10}^{23}=32$ g

Thus, the gram atomic mass of element X is 32 g. The element having a gram atomic mass of 32 g is sulphur, represented by the symbol S.