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Two atoms have the same mass number but different atomic numbers. They are:
AIsobars
BIsotopes
CIsomers
DAllotropes
Answer & Solution
Correct answer: A. Isobars
1. Isotopes share atomic number, differ in mass number.
2. Isobars share mass number, differ in atomic number.
3. Allotropes are different physical forms of the same element.
4. So same A and different Z is the definition of isobars.
_Source: Selina Concise Chemistry ICSE Class 9, Ch 4 'Atomic Structure'_
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