only 2 electrons.
2 electrons in the only shell helium has.
2 electrons are found in the outermost electron shell of Helium. 8 electrons are found in the outermost electron shell of all other noble/inert gases.
There are 2 electrons on the outermost shell of calcium.
Sulphur has 6 electrons in its outermost shell.
thallium has 3 electrons in outermost shell.
Helium has 2 valence electrons.
It has 5 electrons in its outermost shell.
2 valence electrons for helium (helium has only 1 shell)
6 electrons.
2 electrons.
There is no Iodone atom, there is however an Iodine atom that has seven valence electrons or seven electrons in outermost shell.
Magnesium has two electrons in its outermost shell.