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

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates