Why is the ionization energy of potassium (K) less than the ionization energy of sodium (Na) ?
A) The ionized electron in K is in a higher energy shell than the ionized electron in Na.
B) Because the core charge remains the same going down a group
C) Because K has more protons in its nucleus than Na.
D) Because the core charge decreases down a group
E) Because the ionized electron in K is in a higher energy shell AND because the core charge of K and Na are the same.
Correct Answer:
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