everyday science MCQ #48836

First ionization energy is the energy needed to remove one electron from a neutral gaseous atom. What is the usual trend across a period from left to right?

everyday science MCQ #48836

  1. Question 1

    Q1. First ionization energy is the energy needed to remove one electron from a neutral gaseous atom. What is the usual trend across a period from left to right?

    • A) It generally increases because effective nuclear attraction to valence electrons rises
    • B) It generally decreases because atoms get bigger across a period
    • C) It is highest for alkali metals on the left
    • D) It is identical for all elements in the same period

    Answer: It generally increases because effective nuclear attraction to valence electrons rises

    Explanation: Across a period, the nuclear charge increases while electrons are added to the same shell, increasing effective nuclear charge and pulling valence electrons closer, so more energy is needed to remove them.