Intext Questions 1. (a) State modern periodic law. Name the scientist whostated the law. (b) What is a periodic table ? How many groups andperiods does modern periodic table have?
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(a) "The physical and chemical properties of the elements are periodic function of their atomic numbers."
the name of the scientist is 'Mosley'
modern periodic table have seven periods and 18 groups.
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●Periodic properties of elements are directly proportional to their atomic number, where atomic number is the no. of protons in that element.
●It was stated by Henry Mosley.
●Periodic table is the tabular representation of chemical elements according to their properties.
●There are 7 periods and 18 groups are there in modern periodic table.
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