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Which element has exactly five electrons in the highest principal energy level (the outer shell)? a. B b. Ba c. P d. Mn
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2 votes
Which element has exactly five electrons in the highest principal energy level (the outer shell)?

a. B
b. Ba
c. P
d. Mn

User Neskews
by
8.1k points

2 Answers

4 votes
This question is asking for an element with 5 valence electrons. Just go to the row it is in (excluding transition metals) and count over.
The answer would be c. P
User Juanjo Rodriguez
by
8.3k points
6 votes
Phosphorus (P) has 5 valence electrons in its outer shell, meaning, it needs 3 more to become a stable element.
User Lou Franco
by
8.7k points
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