Question

How many elements can be accommodated in the present setup of the long form of the periodic table? Explain.

Answer 1

In the modern periodic table the total number of elements present is fixed. The elements that are discovered have been placed properly in the periodic table. The elements in the periodic table are divided into four blocks, s, p, d, and f. Two series of f block elements are present at the bottom of the periodic table.

Complete answer:
The periodic table is a tabular arrangement of all the known elements in order of their increasing atomic number and recurring chemical properties. It consists of rows known as periods and columns known as groups. The periodic table that is currently in use is known as the modern periodic table given by Dimitri Ivanovich Mendeleev in the year $1869$. Mendeleev is known as the father of the periodic table.
In the periodic table, the Elements in the same group are having the same valence electron configuration and hence have similar chemical properties.
Whereas the elements present in the same period are having an increased order of valence electrons. Therefore, when the energy level of the atom increases in a period, the number of energy sublevels per energy level also increases.
There are $94$ elements in the table that occur naturally. Next $95$ to $118$ elements are synthesized in the laboratories or the nuclear reactors. Hence there are in total $118$ elements.
Therefore in the present setup of the long form of the periodic table $118$ elements can be accommodated.

Note:
The elements from $95$ to $118$ are called synthetic elements. They have been given hypothetical names, their only some properties are known, but still, they are accounted for when it comes to the total number of elements in the periodic table.