Boron’s atomic number is 5, meaning that there are 5 protons in each atom of boron. Since protons and electrons are equal, this means there are also 5 electrons in one atom of boron.
Finding the electron configuration of boron is the next step in finding the solution.
The first shell, has a capacity of 2 electrons, 1s^2, and so boron has more than one shell. The next shell’s sub shell 2s^2 is also filled, but one more electron goes into subshell 2p^1.
Since the last energy level, 2, has 3 electrons in it, two in the 2s subshell and one in the 2p subshell, the Lewis Dot Diagram of Boron should have 3 dots.
a. 3