Which of the following elements possesses the fewest valence electrons? bismuth boron barium bromine

The correct answer is barium.

Explanation:

Valence electrons are the electrons present in the valence shell of an atom of an element.

Bismuth has atomic number of 83.

Number of valence electron = 5

Boron has atomic number of 5.

Number of valence electron = 3

Barium has atomic number of 56.

Number of valence electron = 2

Bromine has atomic number of 35.

Number of valence electron = 7

Barium is one of the element in the given options which possesses fewest number of valence electrons

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.

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