3 years ago

If an atom has 7 protons, 8 neutrons and 9 electrons, what is the mass number?

2 answers:

3 0

Mass = protons + neutrons
7+8 = 15 g

3 0

Answer:

Its mass number is 15

And this element is nitrogen N

Explanation:

Because mass number = number of proton + number of neutrons

So 7+ 8 = 15

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