On the ventral surface of the brain, you can observe the optic nerves and chlasma, the pituitary gland, and the mammillary bodies. These externally visible structures form the floor of the

Diencephalon.

Explanation:

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Fluorine is a nonmetallic, diatomic gas with the symbol F and atomic number 9. Atomic number represents the number of protons in the atom. When F is neutral it means that the number of protons is equal to number of electrons. But, when F is an ion (F-), the it has more electrons (10) than protons, meaning its an anion.