Isotopes of calcium?

What is the nuclear composition of the six naturally occurring isotopes of calcium having the following mass numbers:

1) the isotope of calcium with mass number 40
-number of protons? number of neutrons?

2) the isotope of calcium with mass number 42
-number of protons? number of neutrons?

3) the isotope of calcium with mass number 43
-number of protons? number of neutrons?

4) the isotope of calcium with mass number 44
-number of protons? number of neutrons?

5) the isotope of calcium with mass number 46
-number of protons? number of neutrons?

6) the isotope of calcium with mass number 48
-number of protons? number of neutrons?

Answer:
Mass Number Protons/Electrons Neutrons
Ca 40 20 20
Ca 42 20 22
Ca 43 20 23
Ca 44 20 24
Ca 46 20 26
Ca 48 20 28

Standard atomic mass: 40.078(4) u
I don't know that Ca40 is an isotope. But anyway..Ca number on Periodic Table is 20 which mean 20 protons & 20 neutrons.

Ca42 21 protons 21 neutrons
Ca44 22 P 22 N
Ca46 23 P 23 N
etc
Dude:

Calcium's atomic number is 20, that means each isotope has 20 protons. The mass number of any atom is the number of protons plus the number of neutrons. So all you need to do is subtract 20 from each of those numbers to get the number of neutrons. You should be able to figure this out for yourself from here.

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