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. [1 Mark]

a. Only II is correct
b. I, II are correct
c. II, III are correct
d. I, II, III are correct

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Solution

The correct option is d. I, II, III are correct. [1 mark]

Limitations of Mendeleev’s periodic table are:

No proper position to hydrogen was given.

No different positions are given to isotopes.

Rule of increasing order of atomic mass was not obeyed in the case of Te and I.

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Question 4
Which of the following statement(s) about the Modern Periodic Table 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 masses

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

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

(a) (i) only
(b) (i), (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (iv) only

Name two elements whose atomic weights are corrected on the basis of their positions in the Mendeleev periodic table.

Based on the statements given below, choose the ones that are the limitations of Mendeleev’s periodic table.

I. The position of hydrogen in the periodic table was uncertain.

II. It could not fit in noble gases when they were discovered.

III. The isotopes were not assigned specific places in the periodic table.

Q. Match Column-I (atomic number of elements) with Column-II (position of element in periodic table) and select the correct answer using the codes given below:

Column-I

Column-II

Q. The resonating structures for

N_{2} O

are given below :

Choose the correct decreasing order of stablity:

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The correct option is d. I, II, III are correct​. [1 mark] Limitations of Mendeleev’s periodic table are: No proper position to hydrogen was given. No different positions are given to isotopes. Rule of increasing order of atomic mass was not obeyed in the case of Te and I.

The correct option is d. I, II, III are correct. [1 mark]

Limitations of Mendeleev’s periodic table are:

No proper position to hydrogen was given.

No different positions are given to isotopes.

Rule of increasing order of atomic mass was not obeyed in the case of Te and I.