Question

31. 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?
A. Element with 20 protons and 18 neutrons
B. Element with 18 protons and 19 neutrons
C. Element with 20 protons and 19 neutrons
D. Element with 18 protons and 22 neutrons​

Answer 1

Step-by-step explanation:

Calcium has an atomic mass of 40 and an atomic number of 20 so the number of neutrons must benumber of neutrons = 20

An atom of the calcium-40 isotope has 20 neutrons in its nucleus.

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