everyday science MCQ #49401

What is the atomic number of Sodium (Na)?

everyday science MCQ #49401

  1. Question 1

    Q1. What is the atomic number of Sodium (Na)?

    • A) 11
    • B) 12
    • C) 13
    • D) 14

    Answer: 11

    Explanation: Sodium (Na) has 11 protons in its nucleus, giving it atomic number 11; it sits in Period 3, Group 1 of the periodic table. Its single outer-shell electron is readily lost to form the Na⁺ ion, making sodium a highly reactive metal.