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Mendeleev's Periodic Law

Which of the ...

Question

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

A

Elements in the modern periodic table are arranged on the basis of increasing atomic masses.

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B

Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers.

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C

Atomic number defines total number of neutrons in the nucleus.

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D

The physical and chemical properties of elements are the periodic function of their atomic numbers.

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Solution

The correct option is D
The physical and chemical properties of elements are the periodic function of their atomic numbers.

Modern periodic law states that the physical and chemical properties of elements are periodic functions of their atomic numbers. Modern periodic table is a chart of elements in which the elements have been arranged in an increasing order of their atomic numbers. Atomic number is the number of protons in the nucleus or number of electrons revolving around the nucleus of an atom. According to Mendeleev’s periodic law, the properties of elements are periodic function of their atomic masses. In Mendeleev’s periodic table, the elements are arranged in order of increasing atomic masses and the elements with similar properties occur at regular intervals.

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

(a) Elements in the modern periodic table are arranged on the basis of increasing atomic numbers

(b) Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers

(c) In the modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.

(d) In the modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

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.

In the modern periodic table, the elements are arranged on the basis of their increasing atomic number.

Q. 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

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.

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