Question

Periodic table is an arrangement of elements, based on certain law known as:
A. elemental law
B. periodic law
C. both A and B
D. none of these

Answer 1

Hint: Modern periodic table is based on the order of the increasing atomic numbers. This periodic table is based on the periodic table of Mendeleev that arranged the elements in order of their atomic masses. The periodic table is arranged such that the elements having similar properties are grouped together in blocks like s, p, d and f.

Complete answer:
The chemical elements are arranged in a certain order that tells their physical and chemical properties. This arrangement of elements is done in a periodic table. It consists of vertical columns called groups and horizontal rows called periods.
The elements in the periodic table are arranged in the increasing order of their atomic number. The law that arranges the elements can be stated as ‘ the physical and chemical properties of elements are the periodic function of their atomic numbers’. Therefore, this law is called modern periodic law.
In arranging the elements by the periodic law, many chemical and physical properties of elements can be seen to be grouped in similar periods and groups.
 Hence, the periodic table is an arrangement of elements, based on a certain law known as periodic law.

So, option B is correct.

Note:
The periodic table consists of 18 groups and 7 periods. The elements of the same group in the periodic table have almost similar properties. Also the period number tells the number of shell ‘n’. The elements are grouped in blocks like s, p, d, and f where they have elements in which the valence electrons enter into these respective sub shells.