Considering the chemical properties, atomic weight of $Be$ was corrected based on:

Q. Select the correct alternative from the statements that are not related to Mendeleev's periodic table.

Q. Arrange the following statements in a chronological order.
(a) Some elements be grouped in set of three elements in the increasing order of their atomic weights in which the atomic weight of the middle element was found to be the arithmetic mean of the atomic weights of the other two elements.
(b) The physical and chemical properties of elements are periodic functions of their atomic numbers.
(c) The physical and chemical properties of elements are periodic functions of their atomic weights.
(d) When elements are arranged in the increasing order of their atomic weights, the eighth element resembles the first in physical and chemical properties just as the eighth note on a musical scale resemble the first one.

Q. The chemical properties and atomic masses of oxygen and carbon are different. This was explained in:

Q. The atomic masses of three elements $A$, $B$ and $C$ having similar chemical properties are $7$, $23$ and $39$ respectively.
(a) Calculate the average atomic mass of elements $A$ and $C$.
(b) Compare the average atomic mass with atomic mass of $B$.
(c) What could the elements $A$, $B$ and $C$ be?

Q. Although the order of elements is based on atomic number, vertical families shows similar chemical properties.