everyday science MCQ #48838

In many introductory schemes the Roman numeral A group number for main-group elements equals what simple electron count for the atom?

everyday science MCQ #48838

  1. Question 1

    Q1. In many introductory schemes the Roman numeral A group number for main-group elements equals what simple electron count for the atom?

    • A) The total number of electrons in all shells combined
    • B) The number of neutrons in the nucleus
    • C) The number of valence electrons for representative groups in basic rules
    • D) The number of core electrons only

    Answer: The number of valence electrons for representative groups in basic rules

    Explanation: In the traditional Roman-numeral A-group system, the group number directly equals the number of valence (outermost shell) electrons for representative main-group elements, which determines their typical combining capacity.