Question

Match the given pair of elements with the corresponding relation between them.

• A. Isobars
• B. Isotones
• C. Isotopes

Answer 1

Atoms of the same element having same number of protons but a different number of neutrons are called isotopes.

Atoms of different elements which have same mass number and different atomic number are called isobars.

Atoms having same number of neutrons but a different atomic number are called isotones.

$\begin{array}{cccc}\text{Element}& \text{No. of neutron}& \text{No. of protons}& \text{Mass no.}\\ {}_6^{12}C& 6& 6& 12\\ {}_6^{14}C& 8& 6& 14\\ {}_7^{14}N& 7& 7& 14\\ {}_8^{16}O& 8& 8& 16\end{array}$

${}_6^{12}\text{C}$ and ${}_6^{14}\text{C}$ have same number of protons but different number of neutrons. So, they are isotopes.

${}_6^{14}\text{C}$ and ${}_7^{14}\text{N}$ have same mass number. So, they are isobars.

${}_6^{14}\text{C}$ and ${}_8^{16}\text{O}$ have same number of neutrons. So, they are isotones.