Question

Mass number of calcium is 40 and electronic configuration is 2,8,8,2 find the number of neutrons

Answer 1

20.

this is because 2+8+8+2=20

so the electron number=20.

meaning that the proton number=20.  so 40-20=20

which is the neutron number=20.

hope it helps

Answer 2

Explanation:

Refer to attachment

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