Question

How is heleium different from hydrogen? Give 4 valid points

Answer 1

1. Hydrogen is a diatomic gas, and helium is a monatomic gas.
2. Helium has a fully filled s orbital (1s2), but in hydrogen, there is only one electron (1s1), so it is unstable.
3. Helium is lighter than air, but hydrogen is slightly heavier than air.
4. Hydrogen is extremely flammable, helium is non flammable.
5. There are seven isotopes of helium, but for hydrogen, there are only three naturally occurring isotopes.