The two electrons in a helium atom occupy and have electron spins.
orbital(s)

a the same, opposite
b different; the same
c the same, the same
d different; different

Ithink is d. physical property

100%sorry if i’m wronghope this good luck: )

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom