What are the number of neutrons , protons and electrons in the Fluorine molecule i.e., F 2 molecule?

The F2 molecule has a total of 18 protons, 18 electrons, and typically 20 neutrons (assuming the common isotope 19F for each atom). Each fluorine atom contributes 9 protons, 9 electrons, and 10 neutrons, so the diatomic molecule doubles those counts.

• For a neutral atom, protons = atomic number; electrons = protons; neutrons = mass number − atomic number. Fluorine’s atomic number is 9 and its common mass number is 19, so one F has 9 p, 9 e, and 10 n. F2 contains two such atoms, so totals are doubled.

Per-atom breakdown (F)

• Protons in one F atom: 9 (atomic number Z = 9).
• Electrons in one neutral F atom: 9 (neutral atom ⇒ electrons = protons).
• Neutrons in one F-19 atom: 19 − 9 = 10 (using the common isotope 19F).

Molecular totals (F2)

• Protons: 2 × 9 = 18 in F2.
• Electrons: 2 × 9 = 18 in neutral F2.
• Neutrons: 2 × 10 = 20 in F2 when each atom is 19F.

Note on isotopes: Natural fluorine is essentially all 19F, so the neutron count of 10 per atom (20 per F2) is standard; different isotopes would change neutron counts but not protons or electrons in neutral species.