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  1. The element with highest first ionisation energy is

    2. A.

     Hydrogen
    B.

     Helium
    C.

     Lithium
    D.

     Sodium

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    Answer : Option B

    Explanation :

    The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.

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