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Classification of Modern Periodic Table

what is the p...

Question

what is the position of hydrogen in the modern periodic table? where are isotopes of the same elements having different atomic masses placed in the modern periodic table

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Solution

Hydrogen is placed in the first group and First period in the periodic table. It has only one electron in its shell thus, its placement in first group.In periodic table, the isotope of an element is placed with the element as the atomic number is same. U-234, U-235 and U-238 will all be placed together in the periodic table.

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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.

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.

Q. Which of the following statement is correct in regard to the classification of elements?

(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

Q. Assertion :The placement of isotopes in Mendeleev's periodic table overcome in the modern periodic table. Reason: In modern periodic table, the elements have been allotted places based on their atomic numbers

(a) State modern periodic law.

(b) How does the electronic configuration of the atom of an element relate to its position in the modern periodic table?

(c) How could the modern periodic law remove various anomalies of Mendeleev’s periodic table? Explain with examples.

(d) Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?

(e) Name the scientist who prepared the modern periodic table.

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