An isotope of a mystery element has 8 protons, 8 electrons, and 10 neutrons. What is its mass number?

Fourth Option

Explanation:

You find a isotopes mass number by adding the number of protons and neutrons together.

Mass Number = 18amu

The mystery element is the element oxygen because oxygen has 8 protons, 8 electrons and 10 neutrons.

Hope this helps.

Explanation:

The mass number is the sum of protons and neutrons.

This mystery element's isotope has 8 protons and 10 neutrons. Protons and neutrons are both equal to 1 amu, so 8 protons is 8 amu and 10 neutrons is 10 amu.

Add.

The mass number of this isotope is 18 atomic mass units.

it was spontaneous.

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