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Count lone pairs or non-bonded electrons in a Lewis structure

This type of question, asked 5 times: 25 Jan 2023, 10 Apr 2023, 5 Apr 2024, 29 Jan 2025, 4 Apr 2026 S1. All 5 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    25 Jan 2023

    59
    The total number of lone pairs of electrons on oxygen atoms of ozone is

  2. Question 2

    10 Apr 2023

    144
    The number of molecules from the following which contain only two lone pair of electrons is___ H2O,N2,CO,XeF4,NH3,NO,CO2, F2H_{2}O,N_{2},CO,XeF_{4},NH_{3},NO,CO_{2},{\text{ }F}_{2}

  3. Question 3

    5 Apr 2024

    59
    In the lewis dot structure for NO2−NO_{2}^{-}, total number of valence electrons around nitrogen is .....

  4. Question 4

    29 Jan 2025

    125
    Total number of non -bonded electrons present in NO2−NO_{2}^{-}ion based on Lewis theory is ______\_\_\_\_\_\_ .

  5. Question 5

    4 Apr 2026 S1

    46
    According to Lewis theory, the total number of σ\sigma bond-pairs and lone pair of electrons around the central atom of XeO64−{XeO}_{6}^{4 -} ion is ____\_\_\_\_ .