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10th Class Science Periodic Classification of Elements Question Bank Periodic Classification of Elements

  • question_answer
    Following elements are present in the second period of the periodic table from left to right. Li, Be, B, C, N, O, F, Ne Few statements are given about these elements:
    (i) O and F exist as a monoatomic gases
    (ii) is the lightest element in the period
    (iii) B is a metalloid while C is a metal.
    (iv) Li and F react to form a compound LiF.
    The correct statements are

    A) (i) and (iii) only 

    B) (ii) and (iv)only              

    C) (ii) and (iii) only

    D) (i) and (iv) only

    Correct Answer: B

    Solution :

    Q and F exist as diatomic gases, \[{{O}_{2}}\] and \[{{F}_{2}}\]respectively. Li is the lightest element of the second period having atomic mass 6.9. B is a metalloid while C is a non-metal. Li and F react to form an ionic compound, LiF. \[L{{i}^{+}}+{{F}^{-}}\xrightarrow{{}}LiF\]


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