Read the given statements carefully.
(a) There are total of 7 columns in the Modern periodic table.
(b) Mendeleev arranged the elements in the increasing order of their atomic numbers and according to their chemical properties
(c) Newlands’ law of Octaves worked well with lighter elements only.
The correct statement(s) is/are

Only (b)

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Only (c)

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Only (a)

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Both (a) and (b)

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Solution

The correct option is B Only (c)
The Modern periodic table has 18 vertical columns known as ‘groups’ and 7 horizontal rows known as ‘periods’.
Mendeléev arranged the elements in the order of their increasing atomic masses and also on the basis of similarity of chemical properties.
Newlands’ Law of Octaves was applicable only upto calcium, as after calcium, every eighth element did not possess properties similar to that of the first. Hence, it worked well with lighter elements only.
Hence, the correct answer is option (b).

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Similar questions

Q. According to Newlands' law of octaves, the elements were arranged in the increasing order of their atomic masses.

Q. State whether the following statements are true of false:

(a) Newlands divided the elements into horizontal rows of eight elements each.
(b) According to Mendeleev's periodic law, the properties of elements are a periodic function of their atomic numbers.
(c) The elements in a group have consecutive atomic numbers.

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

Q. Arrange the following statements in a chronological order.
(a) Some elements be grouped in set of three elements in the increasing order of their atomic weights in which the atomic weight of the middle element was found to be the arithmetic mean of the atomic weights of the other two elements.
(b) The physical and chemical properties of elements are periodic functions of their atomic numbers.
(c) The physical and chemical properties of elements are periodic functions of their atomic weights.
(d) When elements are arranged in the increasing order of their atomic weights, the eighth element resembles the first in physical and chemical properties just as the eighth note on a musical scale resemble the first one.

Q. Mendeleev arranged the elements in increasing order of their atomic masses and according to their physical properties.

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