Question

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

Answer 1

Answer:

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.

$[Bi]=[Xe]6s^26p^3$

Number of valence electron = 5

Boron has atomic number of 5.

$[B]=[He]2s^22p^1$

Number of valence electron = 3

Barium has atomic number of 56.

$[Ba]=[Xe]6s^2$

Number of valence electron = 2

Bromine has atomic number of 35.

$[Br]=[Ar]4s^24p^5$

Number of valence electron = 7

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

Answer 2

Bismuth has 5 valence electrons
Boron has 3 valence electrons 
Barium has 2 valence electrons
Bromine has 7 valence electrons

So therefore, the correct answer would be Barium.