Question

what are the two criteria used in development of modern periodic table

Answer 1

1 ) It is based on atomic number .

2) properties of elements.

Answer 2

The two criteria used in the development of the modern periodic table are:

1. The atomic number or the atomicity of elements:

• In the periodic chart, all elements are arranged according to their atomic number, which increases subsequently.
• The number of electrons or protons in an atom is represented by this atomic number.

2. The periodicity of elements/Similarity of elements:

• All of the elements that fit into certain groups and periods are listed in the modern periodic table.
• The resemblance of an element to another element is represented by these groupings and periods. This resemblance occurs in groups and periods at regular intervals.

• As a result, these two criteria were employed to create the modern periodic table.