Which of the following represents isotopes and which represents isobars ?
${}_{5}^{10}B, {}_{5}^{11}B$
${}_{19}^{40}K, {}_{20}^{40}{Ca}$
${}_{92}^{235}U, {}_{92}^{238}U$
${}_{10}^{22}N e, {}_{11}^{22}N e$
${}_{1}^{3}H, {}_{2}^{3}H$
${}_{14}^{28}{Si}, {}_{14}^{29}S i$

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Solution

Isotopes are atoms of the same element which have the same atomic number but different mass numbers.
Isobars are the atoms of different elements having same mass number but different atomic numbers.
The given elements are written in this form: ${}_{Atomic Number}^{Mass Number}X$
Therefore,
${}_{5}^{10}B, {}_{5}^{11}B$ $\to$ isotopes (as they have same atomic number but different mass numbers).
${}_{19}^{40}K, {}_{20}^{40}{Ca}$ $\to$ isobars (as they have same mass number but different atomic numbers).
${}_{92}^{235}U, {}_{92}^{238}U$ $\to$ isotopes (as they have same atomic number but different mass numbers).
${}_{10}^{22}N e, {}_{11}^{22}N e$ $\to$ isobars (as they have same mass number but different atomic numbers).
${}_{1}^{3}H, {}_{2}^{3}H$ $\to$ isobars (as they have same mass number but different atomic numbers).
${}_{14}^{28}{Si}, {}_{14}^{29}S i$ $\to$ isotopes (as they have same atomic number but different mass numbers).

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