Question

use the periodic table to answer the question.
based on patterns in the periodic table, which ion has a stable valence electron configuration?
(1 point)
sulfur (s) with a 1^- charge
potassium (k) with a 1^+ charge
magnesium (mg) with a 1^- charge
fluorine (f) with a 1^+ charge

Explanation:

Step1: Determine the valence electrons of each element

• Sulfur (S) has 6 valence electrons. If it gains 1 electron (\(S^{1 -}\)), it has 7 valence electrons, which is not a stable noble - gas configuration.
• Potassium (K) has 1 valence electron. When it loses 1 electron (\(K^{1+}\)), it has the electron configuration of argon (a noble gas with 8 valence electrons in its outer shell), which is stable.
• Magnesium (Mg) has 2 valence electrons. Gaining 1 electron (\(Mg^{1 -}\)) does not give it a noble - gas configuration.
• Fluorine (F) has 7 valence electrons. Losing 1 electron (\(F^{1+}\)) does not give it a noble - gas configuration.

Answer:

potassium (K) with a \(1^{+}\) charge