2.
You are in terrible need of a Periodic Table. It's really not that difficult, and it's well worth learning.
Helium (He) has 2 electrons in its outer shell. Calcium (Ca) has 2 electrons in its inner shell and 8 electrons in its outer shell.
8 electrons (except for helium which has 2)
Helium has only two electrons with one ring (or energy level). Both the electrons are in the one and only energy level / shell / ring.
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.
Vanadium has on the outer shell two electrons.
2 valence electrons for helium (helium has only 1 shell)
Helium (He) has 2 electrons in its outer shell. Calcium (Ca) has 2 electrons in its inner shell and 8 electrons in its outer shell.
2
2 valence electrons for helium (helium has only 1 shell)
2 valence electrons
8 electrons (except for helium which has 2)
2 electrons in the only shell helium has.
Helium has only two electrons with one ring (or energy level). Both the electrons are in the one and only energy level / shell / ring.
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.
Calcium has two electrons in the outer shell.
Vanadium has on the outer shell two electrons.
He :The number of electrons in an atom's outer electron shell determines how many dots there are. Helium has 2 electrons in its outer electron shell, so 2 dots.