What trend does the first ionization energy follow in the periodic table?A.It stays the same within a family.B.It decreases when going across a family.C.It decreases when going down a group.D.It increases when going down a group.
Question
What trend does the first ionization energy follow in the periodic table?A.It stays the same within a family.B.It decreases when going across a family.C.It decreases when going down a group.D.It increases when going down a group.
Solution
The first ionization energy generally increases when going across a period (from left to right) on the periodic table. This is because as you move across a period, the number of protons in the nucleus increases, which increases the positive charge and pulls the electrons in closer. This makes it harder to remove an electron (higher ionization energy).
On the other hand, the first ionization energy generally decreases when going down a group (from top to bottom) on the periodic table. This is because as you move down a group, the number of energy levels (shells) increases, which means the outermost electrons are further from the nucleus. This makes it easier to remove an electron (lower ionization energy).
So, the correct answer to your question is C. It decreases when going down a group.
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