Question

state modern periodic law. how many groups and periods are present in modern periodic table

Answer 1

Modern periodic law

• The modern periodic law related to the periodic table was put forth by Henry Moseley.
• The law states that "The physical and chemical properties of elements are periodic functions of their atomic numbers."
• The modern periodic table has 7 periods and 18 groups.
• Among the 7 periods, 1st, 2nd and 3rd are short periods, 4th, 5th and 6th are called long periods and 7th is called incomplete long period.
• The 18 groups are is further classified as Alkali earth metals, transition metals, halogens, Noble gas etc.

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Difference between Mendeleev and modern periodic table

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Explain why, the first period of the modern periodic table has only two elements whereas second period has eight elements

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Answer 2

Explanation:

The modern periodic table has 7 periods and 18 groups. Among the 7 periods, 1st, 2nd and 3rd are short periods, 4th, 5th and 6th are called long periods and 7th is called incomplete long period. The 18 groups are is further classified as Alkali earth metals, transition metals, halogens, Noble gas etc.