Based on the statements given below, choose the correct one’s regarding limitations of Mendeleev’s periodic table.

I. The position of hydrogen in the periodic table was uncertain.
II. Isotopes of elements were not given different positions in the table.
III. In the arrangement of Te and I, the increasing order of atomic mass was not obeyed.

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Which of the following statement (s) about the Modern Periodic Table are incorrect

(i) The elements in the Modern Periodic Table are arranged based on their decreasing atomic number.

(ii) The elements in the Modern Periodic Table are arranged based on their increasing atomic masses.

(iii) Isotopes are placed in an adjoining group (s) in the Periodic Table.

(iv) The elements in the Modern Periodic Table are arranged based on their increasing atomic number.

state the periodic law in which mendeleev s periodic table was based .why was this periodic law changed ? name two elements whose properties were predicted on the basis of their position in mendeleevs periodic table.

Q. In certain pair of elements, the increasing order of atomic masses was not obeyed. Is it true according to Mendeleev's 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.

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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