Question

Define modern periodic law.

Answer 1

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★ The modern Periodic law can be stated as: “The physical and chemical properties of the elements are periodic functions of their atomic numbers”. The atomic number is equal to the number of electrons or protons in a neutral atom.

Answer 2

Answer:

1) in 1913 English scientists Henry Moseley discovered that atomic number is the most fundamental property of an its atomic mass

2) atomic number ( z) of an element is the number of protons present in the nucleus of atom

3) Law : ''properties of element are periodic function of their atomic number