Can someone please help me with this? i don't understand chemistry and please provide explanations.

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat