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Number of Elements in a Period

in which grou...

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in which group and period hydrogen should be placed 1. in mendeleev's periodic table 2. in modern periodic table

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Q. Which group elements of modern periodic table were placed along with alkali metals in Mendeleev table?

Q. Why is Hydrogen placed in group

I

of the modern periodic table ?

Q. (a) How were the positions of isotopes of an element decided in the modern periodic table?
(b) How were the positions of cobalt and nickel resolved in the modern periodic table?
(c) where should hydrogen be placed in the modern periodic table? Give reason for your answer.

Hydrogen can be placed in group 1 and group 17 of periodic table. Why?

Q. Which of the following statement(s) about the Modern periodic table is/are incorrect?
(i) The elements in the Modern periodic table are arranged on the basis of their decreasing atomic number.
(ii) The elements in the Modern periodic table are arranged on the basis of their increasing atomic number
(iii) Isotopes are placed in an adjoining group(s) in the periodic table.

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