JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Sample Paper Topic Test - Structure of Atom

From the following list of atoms, choose the no. of pairs of isotopes, isobars and isotones respectively \[[_{8}^{16}O,_{19}^{39}K,_{19}^{335}U,\] \[_{19}^{40}K,_{7}^{14}N,_{8}^{18}O,\] \[_{6}^{14}C,_{20}^{40}Ca,_{92}^{238}U]\]

A) 3, 2, 2

B) 2, 3, 2

C) 2, 2, 3

D) 2, 2, 2

Correct Answer: A

Solution :

[a] Isotopes:

\[\left( _{8}^{16}O,\,_{8}^{18}O \right),\,\left( _{19}^{39}K,\,_{19}^{40}K \right),\,\left( _{92}^{235}U,\,_{92}^{238}U \right)\]

Isobars: \[\left( _{19}^{39}K,\,_{20}^{40}Ca \right),\,\left( _{6}^{14}C,\,_{8}^{16}O \right)\]

Isotones: \[\left( _{19}^{39}K,\,_{20}^{40}Ca \right),\,\left( _{6}^{14}C,\,_{8}^{16}O \right)\]