[Campbell Biology P.85] A lithium atom has 3 protons and 4 neutrons. What is its mass number? | Practice Question

A lithium atom has 3 protons and 4 neutrons. What is its mass number?

  • A: 3
  • B: 4
  • C: 7
  • D: 10

Explanation

The mass number of an atom is defined as the total number of protons and neutrons in its nucleus. For a lithium atom with 3 protons and 4 neutrons, the mass number is 3 + 4 = 7.