Periodic Trends in Atomic Size

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Effective nuclear charge - Real Chemistry

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Key Questions

  • Answer:

    Atomic size increases with increase in period number.(as we move from above to below in a group )

    Atomic size decreases as we move from left to right in a period .

    Explanation:

    As period number increases , number of shells increase , so atomic size increases .

    As we move from left to right in a period , number of electrons in shell increase , so effective nuclear charge ( force of attraction between nucleus of atom which has +ve charge and electrons which have -ve charge) increases so shells are closer to nucleus and atomic size is less .

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