11th Class Chemistry Classification of Elements and Periodicity in Properties

  • question_answer 20) How do atomic radius vary in a period and in a group? How do you explain the variation?

    Answer:

    Within a group, the atomic radius increases down the group. This is because a new energy shell is added in each succeeding element which decreases force of attraction towards nucleus. In a period, the atomic radius decreases from left to right as effective nuclear charge increases from member to member.

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