What is the general trend of ionization energy across a period?

What is the general trend of ionization energy across a period?

Correct Answer: Ionization energy increases across a period.

Step 1: Understand what ionization energy is. It is the energy required to remove an electron from an atom.
Step 2: Know that a 'period' refers to a row in the periodic table where elements have the same number of electron shells.
Step 3: Recognize that as you move from left to right across a period, the number of protons in the nucleus increases. This is called increasing nuclear charge.
Step 4: Realize that with more protons, the positive charge of the nucleus attracts the electrons more strongly.
Step 5: Understand that because of this stronger attraction, it becomes harder to remove an electron, which means the ionization energy increases.
Step 6: Conclude that the general trend of ionization energy across a period is that it increases.

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