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.

Drive down any three characteristic of modern periodic table

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal. b. he is determining chemical properties that are sufficient to identify the metal. c. he is determining physical properties that are insufficient to identify the metal. d. he is determining chemical properties that are insufficient to identify the metal.