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Which of the following elements has the highest ionization energy?

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Question: Which of the following elements has the highest ionization energy?

Options:

  1. Li
  2. Na
  3. K
  4. Rb

Correct Answer: Li

Solution: 

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

Which of the following elements has the highest ionization energy?

Practice Questions

Q1
Which of the following elements has the highest ionization energy?
  1. Li
  2. Na
  3. K
  4. Rb

Questions & Step-by-Step Solutions

Which of the following elements has the highest ionization energy?
Correct Answer: Lithium (Li)
  • Step 1: Understand what ionization energy is. It is the energy required to remove an electron from an atom.
  • Step 2: Know that elements in the same group (like alkali metals) have similar properties.
  • Step 3: Recognize that ionization energy generally increases as you move up a group in the periodic table.
  • Step 4: Compare the atomic sizes of the alkali metals. Smaller atoms have higher ionization energy because their electrons are held more tightly.
  • Step 5: Identify the alkali metals: Lithium (Li), Sodium (Na), Potassium (K), etc.
  • Step 6: Determine that Lithium (Li) is the smallest atom among these alkali metals.
  • Step 7: Conclude that Lithium (Li) has the highest ionization energy due to its smaller atomic size.
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