Which law states that when elements are arranged in the order of increasing atomic masses, the atomic mass of the middle element of the triad is approximately the average of the atomic masses of the other two elements?

Which law states that when elements are arranged in the order of increasing atomic masses, the atomic mass of the middle element of the triad is approximately the average of the atomic masses of the other two elements? Correct Answer Dobereiner’s law of triads

The Correct Answer is Option 4 i.e Dobereiner’s law of triads.

• Avogadro Law:
  • It states that equal volumes of different gases will contain equal numbers of molecules under the same conditions of temperature and pressure.
• Newland’s law of octaves: 
  • It states that when elements are arranged in order to increase atomic masses, every eighth element has properties similar to the first.
• Mendeleev’s law:
  • The law states that the physical and chemical properties of the elements are the periodic function of their atomic masses.
• Dobereiner’s law of triads:
  • Dobereiner’s law of triads states that when elements are arranged in the order of increasing atomic masses, the atomic mass of the middle element of the triad is approximately the average of the atomic masses of the other two elements.
  • Example: 
    • In the triad of Lithium, Sodium, and Potassium, the atomic mass of Lithium is 7 and the atomic mass of Potassium is 39. The average of masses of Lithium and Potassium gives the atomic mass of Sodium 23.