What is ionic compound of fe3+ so4 2-?

The

The ionic compound is Fe2(SO4)3

or It  also called Iron (III) sulfate.

The explanation:

the ionic compound is consist of cations with a positive charge and anions with a negative charge. It is neutral. The chemical compound consist of ions matches and held together by ionic bonding.  

when Fe 3+ (cation) and (SO4) 2- (anion)

by exchange so, the ionic compound is

Fe2(SO4)3 , It is  soluble in water at room temperature

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

elements make up everything, and they combine to make compounds.

the answer is c