what is the proton-proton reaction to create helium from hydrogen?

Answer 1

1H + 1H + 1 n +1n 4 He <-- numbers up here show the masses equivalate
1 1 0 0 = 2 <-- numbers down here show the weights equivalate.

2 hydrogens plus two neutrons = helium. The two +1 charges from hydrogen equal the +2 for helium. Two hydrogens have two masses and two neutrons add the two additional masses

and yes this is fusion :)

Answer 2

Fusion