Cobalt (I) fluoride
how do i write this into a formula?

The answer would be CoF for Cobalt (I) Fluoride.

Explanation:

So first of all you take your periodic table and look at the valence electrons of Fluorine...it is 1. You don't need to look the valence electron of Cobalt because the "I" after Cobalt tells its valence electrons (it is a transition metal that is why). Now that Cobalt has a +1 charge and Fluorine has a -1 charge, it is automatically nuclear (means charge are cancelled out to 0). Therfore the answer is CoF.

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the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.