Question

Use the periodic table to answer the question.

The periodic table of elements shows element groups, periods, and element properties.

Based on patterns in the periodic table, which ion has a stable valence electron configuration?

(1 point)
Responses

potassium (K) with a 1+
charge
potassium (K) with a 1 raised to the plus power charge

sulfur (S) with a 1−
charge
sulfur (S) with a 1 raised to the negative power charge

fluorine (F) with a 1+
charge
fluorine (F) with a 1 raised to the plus power charge

magnesium (Mg) with a 1−
charge
magnesium (Mg) with a 1 raised to the negative power charge
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Answer 1

potassium (K) with a 1+ charge.

Reason: K (Z=19) loses one electron to become K+ with electron configuration [Ar], a noble‑gas (stable) configuration.