Of the following,which element has the highest first ionization energy?
A)aluminum
B)magnesium
C)phosphorus
D)sodium

Question

Quizplus · Accepted Answer

Phosphorus has the highest first ionization energy because it has a smaller atomic radius and higher effective nuclear charge than the other elements listed. This means that the electrons in phosphorus are more strongly attracted to the nucleus, making it harder to remove one electron to form a positive ion.

Of the Following,which Element Has the Highest First Ionization Energy