1s to the second power, 2s to the second power, 2p to the 6th power, 3s to the second power and 3p to the third power.
Answer:
1
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I would say the first three. But I'm not 100% sure. I'm truly sorry if it's wrong
The mass of Hydrogen is 2 g/mol
The mass of Helium is 4 g/mol
