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?

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Element with 18 neutrons and 20 protons.

Element with 19 neutrons and 18 protons.

Element with 19 neutrons and 20 protons.

Element with 22 neutrons and 18 protons.

answer is D.

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Detailed Solution

Atoms having the same mass numbers but distinct atomic numbers are referred to as isobars. Its isobar will be an element with the same mass number as calcium 40. The isobar of calcium will therefore be an element with 18 protons and 22 neutrons.

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