According to Mendeleev’s periodic law, the properties of elements are a periodic function of their atomic numbers.

Rewrite the following statements after correction, if necessary:

Groups have elements with consecutive atomic numbers.

Rewrite the following statements after correction, if necessary:

Periods are the horizontal rows of the elements.

Name the scientists who gave the following laws in the early classification of elements:

Law of octaves

Name the scientists who gave the following laws in the early classification of elements:

Law of triads