How many protons are in an element with an atomic number of 8 and mass number of 18

8

Explanation:

Atomic number = 8

Mass number = 18

The number of protons and the number of electrons is equal to the atomic number.

The number of neutrons in the nucleus is given by the difference in mass number and atomic number.

So, number of protons are 8

number of electrons = 8

number of neutrons = 18 - 8 = 10

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