Question

What is the difference in the approach between Mendeleev's periodic law and the modern periodic law?

Answer 1

HÈLLØ!!

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⭕Russian chemist, Dmitri Mendeleev was the first to develop a periodic table & he gave a law called Mendeleev periodic law which states that the physical & chemical properties of the elements are a periodic function of their atomic masses.

⭕In his periodic table the elements are arranged in vertical rows called groups & horizontal rows known as periods.

⭕There are nine groups & seven periods.

⭕He arranged only 60 elements in periodic table

⭕ A English physicist Moseley, in 1913 gave amodern periodic law which states that the physical & chemical properties of the elements are the periodic function of their atomic number.

⭕This law becomes the base of modern periodic law.

⭕In modern periodic table there are 18 groups & 7 periods.

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THÅÑKẞ!!

Answer 2

Answer:

• Mendeleev’s Approach for periodic law

Chemical properties and Physical properties of the elements are the periodic functions of the atomic mass of the corresponding elements.

• Modern approach for the periodic law

Chemical properties and Physical properties of the elements are the periodic functions of the atomic numbers of the corresponding elements.