Question

carbon
uranium
hydrogen
helium
used to date mummies
very stable and non reactive
explosive, very reactive, made of sun
radioactive

Explanation:

Carbon - 14 is used for dating ancient materials like mummies. Uranium is radioactive. Hydrogen is very reactive and is a major component of the sun. Helium is very stable and non - reactive.

Answer:

Carbon: used to date mummies
Uranium: radioactive
Hydrogen: explosive, very reactive, made of sun
Helium: very stable and non reactive