in the sun the nuclear reactions that occur produce heat and light hydrogen atoms combine to form helium atoms - Science - Stars and the Solar System

Question

in the sun the nuclear reactions that occur produce heat and
light hydrogen atoms combine to form helium atoms But the hydrogen
atom does not contain any netrons when two hydrogen atom combine,
than how does a helium atom form with neutrons in it's nuleus?

Kranav Sharma · Accepted Answer

Hydrogen has many isotopes (seven to be exact) which are
elements having same atomic number but different atomic masses
Protium is the first one and the only one which has a single
electron and proton and no neutron all the others have at least one
neutron in their nucleus In the sun its deuterium (second isotope)
that gets fused into another deuterium to form a helium atom A
deuterium has one neutron in its nucleus and this explains why the
helium formed has two neutrons
Hope your query is resolved now

in the sun the nuclear reactions that occur produce heat and light. hydrogen atoms combine to form helium atoms. But the hydrogen atom does not contain any netrons. when two hydrogen atom combine, than how does a helium atom form with neutrons in it's nuleus?