Question

What is the total no. of elements present in the periodic table?
A. $110$
B. $118$
C. $115$
D. $130$

Answer 1

Hint: We know that there are $18$ vertical columns called groups and $7$ horizontal rows called periods in a periodic table. Also, there are blank spaces included in the periodic table for those elements which were not discovered.

Complete step by step answer:
It is known to us that the periodic table involves tabular representation of elements that are placed according to their increasing atomic numbers. In the periodic table, periods refer to the horizontal rows and groups refer to the vertical columns in which elements are present.
The different elements that exist in nature can be easily studied with the help of periodic table. The periodic table contains $18$ vertical columns that are referred as groups and $7$ horizontal rows that are referred as periods. The elements are placed in the respective groups and periods according to their respective atomic numbers. Atomic number of the element helps in predicting the valence electronic configuration of elements. Elements with similar valence electronic configuration will be placed in the same group and they will have similar chemical properties.
The periodic table has total of $118$ elements. The first element is hydrogen with atomic number $1$ and the ${\rm{11}}{{\rm{8}}^{{\rm{th}}}}$ element is oganesson. Now, the elements with atomic number $113,\;115,\;117$ and $118$ are the current discoveries of elements.
Hence, we can say that, the total no. of elements present in the periodic table is $118$.

Thus, the correct option is B.

Note:
The periodic table organizes the elements according to the similarities in their electronic configuration and their chemical properties.