An element x has 12 neutrons calculate its atomic number if its nucleon number is 42

Element X's atomic number is 30.

Explanation:

So, a nucleon number is the same as a mass number. It is the total number of neutrons and protons in the nucleus. If element X has 12 neutrons, then all we have to do is subtract 12 from 42 and we get our number of protons: 30.

Atomic number is just the number of protons in the nucleus. So, 30 is our answer.

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