Question

Match the following elements with their respective mass numbers:
$$\begin{array}{cc}\text{Elements}& \text{Mass number}\\ \text{(a) Hydrogen}& \text{(i) 6}\\ \text{(b) Beryllium}& \text{(ii) 8}\\ \text{(c) Oxygen}& \text{(iii) 1}\\ \text{(d) Lithium}& \text{(iv) 16}\end{array}$$

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

Answer 1

The correct option is C (a) - (iii)

(b) - (ii)
(c) - (iv)
(d) - (i)
Elements with their respective mass numbers and atomic numbers are given in the following table:

$$\begin{array}{cc}\text{Elements}& \text{Mass number}\\ \text{Hydrogen}& \text{1}\\ \text{Beryllium}& \text{8}\\ \text{Oxygen}& \text{16}\\ \text{Lithium}& \text{6}\end{array}$$

Atomic number = number of protons.
Mass number = number of protons + number of neutrons.
Both atomic number and mass number of hydrogen atom is 1 since it is devoid of neutrons.