1.Number of neutrons in the hydrogen atom? 2. The valency of sodium metal.
3. The valency of noble gases.
4. The valency of chlorine atom.
5. The number of electrons in the outermost shell of nitrogen atom.
6. The maximum number of electrons that can fill the second energy level.
7. The number of electrons in the outermost shell of chlorine atom.
8. The number of electrons in the outermost shell of oxygen atom.
9. The number of electrons in the outermost shell of magnesium atom.
10. The atomic number of fluorine atom.