Correct Answer:
C. 1
Correct answer: 1. Hydrogen has one proton, so its atomic number is 1.
Background: The atomic number is the number of protons in an atom’s nucleus. Hydrogen has one proton.
- 0: 0 would mean no protons.
- −1: Atomic numbers cannot be negative.
- 2: 2 is the atomic number of helium.
Did you know? Hydrogen is the lightest and most abundant element in the universe. Its name means “water-former”.
Memory trick: H = element number 1.
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