Question

According to modern periodic law variations in the properties of elements are related to their

Answer 1

Required Answer:-

- Atomic number.

• Previously, atomic mass was considered as the reason of periodicity of elements.
• Even, Mendeleev's periodic table was based on atomic mass.
• But later, Moseley corrected that the periodicity of the elements is due to its atomic number (no. of protons in the nucleus), not atomic mase.
• He discovered by the help of relation graph between the wavelength and atomic number of elements $.$

Answer 2

Answer:

According to modern periodic law variations in the properties of elements are related to their atomic number.

Explanation :-

• The modern form of periodic table is the one in which the chemical elements are arranged in order of increasing atomic number.
• Elements with similar properties are arranged in the same column (called a group), and elements with the same number of electron shells are arranged in the same row (called a period).