Which of the following ions possess a noble gas electron configuration?
(a) K+
(b) He+
(c) H−
(d) O−
(e) F−
(f) Ca2+
Sample Solution (a) Potassium has atomic number 19, and so a potassium atom has 19 electrons. The ion K+, therefore, has 18 electrons, the same as the noble gas argon. The electron configurations of both K+ and Ar are 1s22s22p63s23p6.
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