Answer:
H - HYDROGEN AND He - HELIUM
Explanation:
Scientists believe that around 100,000 years after the big bang, helium and hydrogen combined to make a molecule called helium hydride for the first time. Helium hydride should be present in some parts of the modern universe, but it has never been detected in space — until now.
HYDROGEN - 1.00784 u
HELIUM - has Z = 2,
