TRUE OR FALSE 1. Groups of 3 elements with similar properties are called Octaves.
2. John Newlands is known for the Law of Triads.
3. Johann Dobereiner was credited for the development of the first Periodic Table.
4. Henry Moseley arranged the elements according to increasing atomic mass.
5. Law of Triads was proposed by Johann Dobereiner.
6. John Newlands left blank spaces for undiscovered elements in his Periodic
Table.
7. Henry Moseley revised the Periodic Law by stating that the properties of
elements are periodic functions of their atomic number.
8. Johann Dobereiner is known for the Law of Octaves.
9. Dimitri Mendeleev arranged the elements in horizontal rows and vertical
columns placing elements with similar properties in the same horizontal rows.
10. The Law of Octaves states that the properties of elements are repeated for
every 8th element when arranged according to increasing atomic number.​