Question

Choose the option which describes best this statement:
“The modern periodic table is based upon”.
A. Atomic mass of the elements
B. Number of neutrons in the nucleus
C. Oxidation states
D. Number of protons in the nucleus
E. Number of protons in the nucleus

Answer 1

Study carefully the main criteria for the classification of elements in the modern periodic table. The classification of elements enables us to predict the properties of the elements and their compounds based on their positions in the Periodic Table, and vice versa. It also becomes easier to study, understand, compare and contrast the connected properties among the elements and their compounds from different groups. So, because of this reason the elements were classified and named it as a periodic table.

Complete step by step answer:
Now let us know what a periodic table of elements is. The periodic table is a tabular array of the chemical elements which are arranged in specific order. Many scientists tried to classify elements on the basis of various criterions. After a lot of research, a modern periodic table was invented.
The modern periodic table was developed by Mendeleev in the early 1800’s. Here the elements are arranged in a grid or matrix.
However, it was in fact perfected by Henry Moseley, an English physicist in 1913. By making alterations to the periodic law, he improved on all the defects of the Mendeleev table.
The classification here was on the basis of ‘Atomic number’. The atomic number is the number of protons in an atom. This atomic number is entirely unique to every element which means that every element on the planet has its own unique atomic number.
Hence the correct answer is option E. That is “The modern periodic table is based upon the Atomic number (Number of protons in the nucleus) of the elements.

So, the correct answer is Option E.

Note: n the periodic table the elements are arranged into periods and groups. A row of elements across the table is called a period. A column of elements down the table is called a group. There are 18 groups in the standard periodic table. There are 118 elements in the modern periodic table.