When does this branch get the lowest number? Put a √ mark against the correct one: While numbering from left to right. While numbering from right to left.

The electronegativity of elements from left to right in a period of periodic table.

Number the carbon atoms in the main chain of the above compound given above. Put a √ against the correct position numbers of the branches.

Account for the following: Atomic radius decreases from left to right in a period

When the reciprocal of a number is subtracted from it, we get 1. What is the number?

The statement that is not correct for the periodic classification of elements is The properties of elements are periodic functions of their atomic numbers. Non-metallic elements are lesser in number than metallic elements. Electronegativity of the elements along the period from left to right increases in a regular manner. For transition elements the d-subshells are filled with the electrons monotonically with increase in atomic number.

Basicity of hydroxides of lanthanoids decreases along the period from left to right. Explain the reason.