Which of the following elements has the highest ionization energy in the alkali

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Question: Which of the following elements has the highest ionization energy in the alkali metal group? (2023)

Options:

Correct Answer: Lithium

Exam Year: 2023

Solution:

Lithium (Li) has the highest ionization energy among the alkali metals due to its smaller atomic size.

Which of the following elements has the highest ionization energy in the alkali metal group? (2023)

Which of the following elements has the highest ionization energy in the alkali metal group? (2023)

Step 1: Understand what ionization energy is. It is the energy required to remove an electron from an atom.
Step 2: Know that alkali metals are in Group 1 of the periodic table. The alkali metals include Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr).
Step 3: Remember that ionization energy generally decreases as you move down a group in the periodic table. This is because the atomic size increases, making it easier to remove an electron.
Step 4: Compare the atomic sizes of the alkali metals. Lithium is the smallest, followed by Sodium, Potassium, and so on.
Step 5: Since Lithium has the smallest atomic size among the alkali metals, it has the highest ionization energy.

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