The mass number of two atoms X and Y is the same (40 each) but their atomic number are different (being 20 and 18 respectively). X and Y are examples of :(a) chemically similar atoms (b) isotopes (c) solid and liquid metals (d) isobars

Academic Chemistry NCERT Class 9

Correct Answer: (d) isobars

Explanation: Isobars are the atoms of different elements with the same mass number but different atomic numbers.

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Updated on: 10-Oct-2022

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