'A deuterium atom is a hydrogen atom that has this keeping its proton company in the nucleus'
a neutron
SCIENCE: A deuterium atom is a hydrogen atom that has this keeping its proton company in the nucleus
A deuterium atom is a hydrogen atom that has this keeping its proton company in the nucleus
A deuterium atom is a hydrogen atom that has this keeping its proton company in the nucleus
SCIENCE
a neutron
SCIENCE