How many valence electrons does cobalt have?

Electron Configuration : [Ar] 3d7 4s2 Valence Electrons: 3d7 4s2 Check out everything about Cobalt using this link Co Cobalt - Element information, facts, properties, trends and uses - SchoolMyKids. read more

Cobalt (Co) has an atomic number of 27, which means it has 27 electrons and protons. Shells hold up to two electrons in the first and eight electrons in the outer shells. So cobalt’s electron configuration with 27 electrons should look like this: 2-8-8-8–1. read more

A: Oxygen has six valence electrons and is assigned a valence number of 2. This means it needs two electrons to satisfy its bonding requirements. read more

I think it is 2 because the orbital notation ends with 4s(2) but I have been looking for confirmation on the internet and I am getting different answers. Some sites say that the d orbital must be accounted for, too--so the 3d(7) plus the 4s(2) would equal 9 valence electrons. read more

The number of valence electrons are held in the outtermost energy level or shell which in this case is 4 ; so THE NUMBER OF VALENCE ELECTRONS of Cobalt is 2. The reason it's not the 4s instead of 3d is because the 3 and 4 represent the number of energy levels so the outtermost is 4. read more

A: Mercury has two valence electrons, both of which sit in the atom's 6s shell. A valence electron is an electron in the outermost shell of an atom. read more