Multiple choice

Which of the following statements is true?

  1. Atomic radii of elements decrease gradually from left to right.

  2. Metallic character increases across a period.

  3. Chemical reactivity increases and then decreases across a period.

  4. Chemical reactivity increases across a period.
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A Correct answer
Explanation

Only statement in option (1) is correct. Atomic radii of elements decrease gradually from left to right because new electrons are added into the same shell and the effective nuclear charge increases across the period.

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