Question

A symbol written in a periodic table represents different ______ in periodic table.
A.Atom
B.Element
C.Formula
D.None of these

Answer 1

Periodic table contains all the elements arranged in order of their increasing atomic numbers.

Complete step by step answer:
The periodic table is also known as the Periodic table of elements. The periodic table is the tabular arrangement of all chemical elements, all of which are arranged in order of increasing atomic numbers. The arrangement is such that elements which have similar outer electronic configurations and hence, similar chemical properties are placed together in the periodic table.
The periodic table is divided into horizontal rows, seven in number. These rows are called periods. The vertical columns, seventeen in number, are called groups. Each group contains elements which have similar chemical properties. This similarity in chemical properties is due to similar outer shell electronic configuration.
Before standardizing atomic number as a means for grouping of elements, atomic mass was also tried as a criterion for grouping of elements. But that grouping did not prove successful because elements which had similar chemical properties were placed far away and those with dissimilar chemical properties were placed together.
The modern periodic table was given by Dmitri Ivanovich Mendeleev. That table has been refined and expanded over the years with the discovery of new elements.

Hence, the answer is option B.

Note:
Atomic number is an appropriate means for grouping of elements as it gives us a uniformity in the table.