How many valence electrons are present in a neutral atom of boron?

• A. 4
• B. 2
• C. 3
• D. 5

Answer: (C)

Verified step by step guidance

1. Identify the element in question, which is boron (B).
2. Determine the atomic number of boron, which is 5, meaning it has 5 electrons in a neutral atom.
3. Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
4. Write the electron configuration of boron: \$1s^2 2s^2 2p^1$.
5. Count the electrons in the outermost shell (the second shell): \$2s^2$ and \$2p^1$ add up to 3 valence electrons.