Which of the following is the most reactive alkali metal? (2019)

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Question: Which of the following is the most reactive alkali metal? (2019)

Options:

Correct Answer: Potassium

Exam Year: 2019

Solution:

Potassium (K) is more reactive than Sodium (Na) and Lithium (Li) due to its larger atomic size and lower ionization energy.

Which of the following is the most reactive alkali metal? (2019)

Which of the following is the most reactive alkali metal? (2019)

Step 1: Understand what alkali metals are. Alkali metals are found in Group 1 of the periodic table and include Lithium (Li), Sodium (Na), Potassium (K), and others.
Step 2: Know that reactivity in alkali metals increases as you move down the group. This is because the atomic size increases and the outer electron is further from the nucleus.
Step 3: Compare the atomic sizes of Lithium, Sodium, and Potassium. Potassium is larger than Sodium, which is larger than Lithium.
Step 4: Recognize that larger atomic size means the outer electron is less tightly held by the nucleus, making it easier to lose that electron.
Step 5: Understand that losing an electron is what makes an alkali metal reactive. The easier it is to lose the electron, the more reactive the metal is.
Step 6: Conclude that since Potassium (K) has a larger atomic size and lower ionization energy compared to Sodium (Na) and Lithium (Li), it is the most reactive alkali metal.

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