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Q: How many protons are there in a lithium nucleus?
  • A. 2
  • B. 4
  • C. 5
  • D. 3
Correct Answer: Option D - Lithium has an atomic number 3 and it has 3 protons in its nucleus.
D. Lithium has an atomic number 3 and it has 3 protons in its nucleus.

Explanations:

Lithium has an atomic number 3 and it has 3 protons in its nucleus.