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
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Answer:
Since, they have same atomic mass number, but different atomic number. This property of an element is called 'Isobar'.
THEREFORE, (d) isobar
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correct answer is option d.
isobars
I hope this answer will help you
thank you
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