What happens when sodium reacts with fluorine to produce sodium fluoride?

Balanced chemical reaction: 2Na (s) + F₂ (g) → 2NaF (s) + energy.

This is exothermic reaction (energy or heat is released), because reactants have higher energy than products of reaction.

In ionic salt sodium fluoride (NaF), fluorine has electronegativity approximately χ = 4 and sodium χ = 1 (Δχ = 4 - 1; Δχ = 3), fluorine attracts electron and it has negative charge and sodium has positive charge.