Question

question 7
1 point
potassium is required in our diet. which of the following is the electron configuration for the potassium ion (k+)? (reference p 197 and figure 3.26 on p 150 of your textbook.)
a k+ = 1s²2s²2p⁶3s²3p⁶4s¹
b k+ = 1s²2s²2p⁶3s²3p⁵
c k+ = 1s²2s²2p⁶3s²3p⁶4s²
d k+ = 1s²2s²2p⁶3s²3p⁶

Explanation:

Step1: Determine the electron configuration of potassium atom

Potassium (K) has an atomic number of 19. The electron configuration of a neutral K atom is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}\).

Step2: Analyze the formation of \(K^{+}\) ion

When \(K\) forms \(K^{+}\), it loses one electron. The electron is lost from the outermost shell. The outermost electron in \(K\) is in the \(4s\) orbital. So, after losing one electron (\(4s^{1}\) electron), the electron configuration of \(K^{+}\) is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}\).

Answer:

D. \(K^{+}=1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}\)