Which of the following sets of atomic number belong to that of alkali metals?

  1. A

    1, 12, 30, 4, 62 

  2. B

    37, 19, 3, 55

  3. C

    9, 17, 35, 53

  4. D

    12, 20, 56, 88

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    Solution:

    Alkali metalsymbolAtomic number
    LithiumLi3
    SodiumNa11
    PotassiumK19
    RubidiumRb37
    CaesiumCs55
    FranciumFr87
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