2.
You are in terrible need of a Periodic Table. It's really not that difficult, and it's well worth learning.
Helium (He) and Calcium (Ca) both have 2 valence electrons.
8 electrons (except for helium which has 2)
There are 8 electrons in the outer level of all the noble gases except helium. This full outer level gives them stability and makes them less reactive. Helium, as a noble gas, has only 2 electrons in its outer level.
Vanadium has on the outer shell two electrons.
There is one electron on cobalts outer shell.
2 valence electrons for helium (helium has only 1 shell)
Helium (He) and Calcium (Ca) both have 2 valence electrons.
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.
There are 8 electrons in the outer level of all the noble gases except helium. This full outer level gives them stability and makes them less reactive. Helium, as a noble gas, has only 2 electrons in its outer level.
Nitrogen has five electrons in its outer shell and bromine has seven in its outer shell.
Boron has three electrons in its outer shell
Vanadium has on the outer shell two electrons.
Calcium has two electrons in the outer shell.