For F2, describe the central atom and number of unshared pairs of electrons in the molecule, if any.

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Atoms of elements combine with each other to form molecules so that the number of electrons in the outermost shell of each atom is equal to that of the nearest noble gas. This can be 2, 8, 18... depending on the number of electronic configuration of the elements.

Fluorine has...

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Atoms of elements combine with each other to form molecules so that the number of electrons in the outermost shell of each atom is equal to that of the nearest noble gas. This can be 2, 8, 18... depending on the number of electronic configuration of the elements.

Fluorine has an electronic configuration of 1s22s22p5with 7 electrons in the outermost shell. It has to gain 1 electron to achieve a stable outermost shell electron configuration of 2s2 2p6. This is done in the F2 molecule by each fluorine atom sharing 1 electron with the other.

This results in a stable electron configuration for each of the atoms. After the bond is formed each fluorine atom has 6 electrons that are not shared.

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