Question

which electron-dot symbol correctly represents an atom of its given element?

Explanation:

• For option a (Boron - B): Boron has 3 valence electrons. The electron - dot symbol should have 3 dots around the symbol. The given symbol for option a has 3 dots, which is correct.
• For option b (Lithium - Li): Lithium has 1 valence electron. The given symbol for option b has 2 dots, which is incorrect.
• For option c (Carbon - C): Carbon has 4 valence electrons. The given symbol for option c has 3 dots, which is incorrect.
• For option d (Sulfur - S): Sulfur has 6 valence electrons. The given symbol for option d has 3 dots, which is incorrect.

Answer:

A. Option a (Boron - B)