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Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?

Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40? Correct Answer Element with 18 neutrons and 22 neutrons

Isobar: one of two or more atoms having equal atomic weights but different atomic numbers.                       Mass number     Electrons      Neutrons     Calcium            40                    20                 20        Argon              40                    18                 22

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