When two hydrogen nuclei combine to form one helium nucleus, nuclear fusion has taken place.

true or false

It is true when they form they form together they make nuclear fusion

Yes. That's a nice, simple, intuitive description of the process that

liberates energy in the cores of stars and "H" bombs.

When 2 Hydrogen nuclei combine to form 1 Helium nucleus,

the combined nucleus has about 0.7% less mass than the

Hydrogen nuclei had. That "missing mass" shows up in the

form of energy leaving the site of the fusion.

Can you say "big boom"?