To draw the electron dot formula (also known as Lewis dot structure) for the given elements, we represent the valence electrons as dots around the element’s atomic symbol.
A. Helium (He)
Helium has 2 valence electrons. Its electron dot formula is represented as:
He: ••
Both dots are paired, showcasing that helium is a noble gas with a complete outer shell.
B. Lead (Pb)
Lead has 4 valence electrons. The electron dot formula for lead is:
Pb: • • • •
These dots can be arranged around the Pb symbol in any configuration, but we often place them on four sides to indicate the available bonding sites.
C. Neon (Ne)
Neon, another noble gas, has 8 valence electrons. Its electron dot formula looks like this:
Ne: • • • • • • • •
All 8 electrons are paired, indicating a stable electron configuration.
D. Boron (B)
Boron has 3 valence electrons. Therefore, its electron dot formula is:
B: • • •
This shows the three valence electrons that boron can use for bonding with other elements.