a. Explain how the ionization energy of atoms changes when proceeding down a group of the Periodic Table at first increases and

Question

a. Explain how the ionization energy of atoms changes when proceeding down a group of the Periodic Table
at first increases and then decreases
generally decreases
generally increases
at first decreases and then increases
b. Explain why this change occurs.
Electrons experience an increasingly stronger pull by the nucleus.
The nuclear charge is higher.
The shielding of an atom's outermost electrons decreases.
Electrons are farther from the positively charged nucleus..

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