Question

Match the following elements with their atomic mass.

(i) Magnesium (ii) Carbon (iii) Oxygen (iv) Sulphur

(a) 32 (b) 16 (c) 12 (d) 24

• A. (i) - (a), (ii) - (d), (iii) - (b), (iv) - (c)
• B. (i) - (d), (ii) - (c), (iii) - (b), (iv) - (a)
• C. (i) - (d), (ii) - (c), (iii) - (a), (iv) - (b)
• D. (i) - (c), (ii) - (a), (iii) - (d), (iv) - (b)

Answer 1

The correct option is B

(i) - (d), (ii) - (c), (iii) - (b), (iv) - (a)

The atomic mass of an elements is expressed by considering $\frac{1}{12}$ the mass of an atom of carbon-12 (C-12) isotope as one unit. It is represented by the symbol 'u'. The table given below is showing the atomic mass of the given elements:

$\begin{array}{cc}\text{Element}& AtomicMass\\ \text{Magnesium}& 24\\ \text{Carbon}& 12\\ \text{Oxygen}& 16\\ \text{Sulphur}& 32\end{array}$

Therefore, the correct match is (i) - (d), (ii) - (c), (iii) - (b), (iv) - (a)