Question

Number of valence electrons in silicon is
A. 3
B. 4
C. 5
D. 6

Answer 1

Hint- In order to deal with this question first we will understand the basic meaning of valence electrons then we will discuss the structure of silicon and according to it we will find the number of valence electrons on the basis of Bohr’s atomic model.

Complete answer:
Valence electron is an outer shell electron associated with an atom that will participate in the forming of a chemical bond if the outer shell is not closed; all atoms in the bond add one valence electron in a single covalent bond in order to form a mutual pair.
On the basis of Bohr’s atomic model we have:
Silicon is element 14 in the Periodic Table
In its first shell, it has two electrons, in the second shell, eight electrons, and in the third shell, four.
Since the electrons are the outermost electrons in the third shell, silicone has four valence electrons.
Hence, the number of valence electrons in silicon is four.

So, the correct answer is option B.

Note- Valence electrons are very important for an atom. An atom's valence electrons are responsible for and assist in the chemical transition. The electrons in the valance decide the atom 's total potential or valence. The number of electrons in the atom that currently engage in a chemical reaction is known as the element valence.