Question

select all that apply
which statements about the formation of potassium iodide are true?
each iodine atom forms a positively charged ion.
each potassium atom forms an ion, k*.
each potassium atom loses an electron.
each iodine atom loses an electron.
each iodine atom forms a 12- ion.
potassium iodide has a neutral charge.

Explanation:

• Potassium (K) is a metal. Metals tend to lose electrons. Potassium has one valence electron. When it loses this electron, it forms a \(K^{+}\) ion.
• Iodine (I) is a non - metal. Non - metals tend to gain electrons. Iodine has 7 valence electrons and gains one electron to form \(I^{-}\) ion (not \(I^{2 -}\) as it only needs one more electron to complete its octet).
• In the formation of potassium iodide (\(KI\)), potassium loses an electron (so each potassium atom loses an electron and forms \(K^{+}\)) and iodine gains an electron (forms \(I^{-}\)). The compound \(KI\) is neutral because the sum of the charges of \(K^{+}\) and \(I^{-}\) is \(+1+( - 1)=0\).

Answer:

• Each potassium atom forms an ion, \(K^{+}\).
• Each potassium atom loses an electron.
• Potassium iodide has a neutral charge.