What is the chemical formula of magnesium bromide? a. mgbr2b. mgbrc. mg2br2d. mg2brthe answer is letter a, i've just taken the test and learned that this was and is the correct answer.

A.

Explanation: Ionic bonds are formed by transfer of electrons between metal and non metals.

Electronic configuration of magnesium:

Magnesium atom will lose two electron to gain noble gas configuration and form magnesium cation with +2 charge.

Electronic configuration of bromine:

Bromine atom will gain one electron to gain noble gas configuration and form bromide ion with -1 charge.

In magnesium bromide, two electrons from metal gets transferred to bromine atom and thus form an ionic bond to give

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.