How many valence electrons are in a silicon atom?
Silicon has four valence electrons.
Silicon is element 14 in the Periodic Table
It has two electrons in its first shell, eight electrons in the second shell, and four electrons in the third shell.
Since the electrons in the third shell are the outermost electrons, silicon has four valence electrons.
The video below shows how to use the Periodic Table to determine the number of valence electrons in silicon.