Ionization energy increases down a group because the number of protons increases and it's more difficult to lose electrons because they are being pulled closer.

Which of the following has the largest ionization energy?

Which of the following elements has the lowest ionization energy?

Order the elements in decreasing ionization energy. Na, S, Al, F, K, O

What is the definition of ionization energy?

Which of the following best explains why ionization energy decreases down a group?

Which has the set of elements has the element with the highest ionization energy?

Mg, Be, Ca, Sr are all in the same __________.

True or false. There are 18 periods and 7 groups.

Which of the following elements is in period 6 and group 4?

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