Question

The horizontal rows in a periodic table are called groups.
[A] True
[B] False

Answer 1

Hint: In the modern periodic table there are 118 elements. These elements are arranged in rows and columns. There are 7 rows and 18 columns. We use a specific term for these rows and columns i.e. period and groups.

Complete step by step solution:
We know that the periodic table is a tabular display of chemical elements found in nature. There are 118 elements in the periodic table. They are arranged according to their atomic number, electronic configuration and repetitive chemical properties.
Now, let us discuss the periodic table briefly to answer this question.
The periodic table has seven horizontal rows and 18 vertical columns.
The horizontal rows have metals towards the left and nonmetals on the right.
The vertical columns have elements having similar chemical behaviours.
The horizontal rows are called period and the vertical columns are called groups.
The first element of the periodic table is hydrogen and the last element is oganesson. All these elements are either found naturally or synthesised artificially.
The first ninety-four elements occur naturally and elements from ninety-five to 118 were synthesized in laboratories from nuclear reactors or nuclear explosions. Numerous radioisotopes of naturally occurring elements have been produced in laboratories.
The elements with higher atomic numbers will be in the eighth row and there are few possible elements that can be synthesised.
We can understand from the above discussion that the horizontal rows are called periods.
So, the statement was given to us- The horizontal rows in a periodic table are called groups is incorrect.

Therefore, the correct answer is option [B] False.

Note: The first-ever periodic table was created by a Russian chemist named Dmitri Mendeleev. Mendeleev’s periodic table has 63 elements. They were placed in a tabular form in increasing order of their relative atomic masses. There were certain limitations to Mendeleev’s periodic table which lead to the modern periodic table.