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Chapter 3: Classification of Elements and Periodicity

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Chapter 3: Classification of Elements and Periodicity

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Questions and Answers

What is the main reason for the filling of 3d orbitals before 4p orbitals in the fourth period?

4p orbitals have lower energy

3d orbitals have higher energy

4p orbitals have higher energy

3d orbitals have lower energy (correct)

What is the general electronic configuration of elements in Group one (alkali) metals?

np1

ns2

ns1 (correct)

np2

Which of the following periods contains synthetic or man-made radioactive elements?

Sixth period

Fourth period

Fifth period

Seventh period (correct)

What is the order of filling of orbitals in the sixth period?

6s, 4f, 5d, 6p Signup and view all the answers

How many elements are present in the fourth period?

18 Signup and view all the answers

What is the primary purpose of classifying elements?

To ease the study and remembrance of elements' properties Signup and view all the answers

What is the number of groups in the modern periodic table as per IUPAC recommendations?

18 Signup and view all the answers

What is the reason for the similar properties of elements in a group?

Same number of electrons in valence orbitals Signup and view all the answers

What is the basis of the modern periodic law?

Atomic numbers of elements Signup and view all the answers

What is the total number of periods in the modern periodic table?

7 Signup and view all the answers

What is the outcome of analyzing the transmitted light in absorption spectrum?

Dark lines separated by bright bands Signup and view all the answers

What is the term used to describe the arrangement of elements in a tabular form according to their properties?

Periodic table Signup and view all the answers

Which period is the shortest in the periodic table?

First period Signup and view all the answers

Which group of elements are also called typical or representative elements?

Group 1, 2, and 13 to 17 Signup and view all the answers

What is the range of atomic numbers for the Lanthanides?

58 to 71 Signup and view all the answers

Why are Lanthanides and Actinides not merged within the main body of the periodic table?

Defect of the long form of the periodic table Signup and view all the answers

What is the notation used to write the electronic configuration of noble gas elements?

[He]2, [Ne]10, [Ar]18, [Kr]36, [Xe]54, [Rn]86 Signup and view all the answers

What is the common characteristic of elements in the d-block?

They are all transition elements Signup and view all the answers