everyday science MCQ #48828

In the modern periodic table what runs horizontally and shows how many electron shells are occupied in the neutral atom in its ground state for the lightest member of that row?

everyday science MCQ #48828

  1. Question 1

    Q1. In the modern periodic table what runs horizontally and shows how many electron shells are occupied in the neutral atom in its ground state for the lightest member of that row?

    • A) A group shows occupied shells for the lightest atom in that column
    • B) A period shows how many shells are filled up to the outermost shell for the first element in that row
    • C) A block shows how many shells exist for every element listed in that block
    • D) A family always equals the number of shells for the heaviest element in that column

    Answer: A period shows how many shells are filled up to the outermost shell for the first element in that row

    Explanation: In the periodic table, periods run horizontally; elements in the same period have the same number of electron shells, with the period number indicating the highest occupied principal quantum number.