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Question

Constituents of nuclei of three atoms A, B and C are given below:
A - 90 protons and 148 neutrons
B - 92 protons and 146 neutrons
C - 90 protons and 146 neutrons
Based on the above data, which of these atoms are isotopes?


A
A and C are isotopes; B and C are isobars
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B
A and B are isotopes; A and C are isobars
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C
B and C are isobars; A and B are isotopes
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D
A and C are isotopes; A and B are isobars
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Solution

The correct option is A A and C are isotopes; B and C are isobars
Isotopes are the atoms which have the same atomic number but different mass number. This is because they contain different number of neutrons.

Atomic number = number of protons

The representation of the given atoms is mentioned below.

23690A, 23892B, 23890C

Here, A and C are isotopes because they have:
- same atomic number (90), i.e. same number of protons.
- different mass numbers (236 and 238) as number of neutrons are different.

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