everyday science MCQ #4884

The elements in the first period of the periodic table are:

everyday science MCQ #4884

  1. Question 1

    Q1. The elements in the first period of the periodic table are:

    • A) Hydrogen and helium
    • B) Hydrogen, helium, nitrogen, and oxygen
    • C) Hydrogen, helium, and carbon
    • D) Hydrogen, nitrogen, and oxygen

    Answer: Hydrogen and helium

    Explanation: The first period of the periodic table contains only hydrogen (atomic number 1) and helium (atomic number 2), corresponding to filling the 1s electron shell.