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Groups in Modern Periodic Table

Which of the ...

Question

Which of the following are the important merits of modern periodic table?

A

It explains why element in the same group have the same chemical properties.

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B

Hydrogen has been placed accurately.

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C

Isotopes have been placed at same position.

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D

It is based on classifying elements according to their atomic number.

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Solution

The correct options are
A It explains why element in the same group have the same chemical properties.
C Isotopes have been placed at same position.
D It is based on classifying elements according to their atomic number.
The modern periodic law is that the properties of the elements are periodic functions of their atomic numbers. The isotopes are not shown separately.
The position of an element in a periodic table depends upon its electronic configuration and properties. Hydrogen resembles the elements of groups I-A, IV-A, and VII-A in some respects. Properties of hydrogen do not completely match any one of the above-mentioned groups. That is why the position of hydrogen is still undecided.

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Similar questions

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

Q. Which of the following are characteristics of isotopes of an element?

(i)

Isotopes of an element have the same atomic masses.

(i i)

Isotopes of an element have the same atomic number.

(i i i)

Isotopes of an element show the same physical properties.

(i v)

Isotopes of an element show the same chemical properties.

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. (a) Explain why, the first period of the modern periodic table has only two elements whereas second period has eight elements
(b) Why do elements in the same group show similar properties but the elements in different groups show different properties?
(c) For each of the following triads, name the element with the characteristics specified below:

Elements	Least atomic radius	Chemically least reactive
(i) F, Cl, Br (ii) Li, Na, K	.................... ....................	.................... ....................

(d) State one reason for keeping fluorine and chlorine in the same group of the periodic table.
(e) What are the merits of the modern periodic table of elements?

Q. Select the correct alternative from the statements that are not related to Mendeleev's periodic table.

(a) The physical and chemical properties of elements are the periodic function of their atomic number.

(b) The elements with higher atomic weight were placed before elements with lower atomic weights.

(c) The physical and chemical properties of elements are the periodic function of their atomic weights.

(d) The atomic number has been established as the fundamental characteristic of elements based on the work on x-ray spectra of elements.

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