Nuclei with the same mass number but different atomic numbers are called isobars. Consider Ca-40, Ca-41, K-41 and Ar-41.
(a) Which of these are isobars? Which are isotopes?
(b) What do Ca-40 and Ca-41 have in common?
(c) Correct the statement (if it is incorrect): Atoms of Ca-41, K-41, and Ar-41 have the same number of neutrons.
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