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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


Sagot :

naǫ
Boron (B) has 3 electrons in the outer shell.
Barium (Ba) has 2 electrons.
Phosphorus (P) has 5 electrons.
Manganese (Mn) has 2 electrons.

The answer is C) P (phosphorus).