The mode answer will be 4: 2 p + 2e

The mean will be more complicated due to a few extra neutrons creeping in occasionally!

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But unfortunately can't zap from the client I'm using right now!

What about the neutrons? 6?

The answer is 6, 1p, 1n, 1e each. Assuming we are talking about the most abundant amount we have. Deuterium and Tritium make up a small fraction only

You are right. Heavy hydrogens are not considered here.