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If the atomic number of K is 19 and the Atomic mass is 39 what is the protons and electrons and neutrons

Sagot :

Explanation:

The Correct Answer is Option 3 i.e 20. The number of neutrons within the nucleus of a given atom can be found by subtracting the atomic number from the atomic mass i.e difference between the mass number of the atom and the atomic number. Number of neutrons = 39 - 19 = 20.

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