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?

<p>6s, 4f, 5d, 6p (B)</p> Signup and view all the answers

How many elements are present in the fourth period?

<p>18 (A)</p> Signup and view all the answers

What is the primary purpose of classifying elements?

<p>To ease the study and remembrance of elements' properties (A)</p> Signup and view all the answers

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

<p>18 (B)</p> Signup and view all the answers

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

<p>Same number of electrons in valence orbitals (A)</p> Signup and view all the answers

What is the basis of the modern periodic law?

<p>Atomic numbers of elements (C)</p> Signup and view all the answers

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

<p>7 (B)</p> Signup and view all the answers

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

<p>Dark lines separated by bright bands (B)</p> 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?

<p>Periodic table (B)</p> Signup and view all the answers

Which period is the shortest in the periodic table?

<p>First period (A)</p> Signup and view all the answers

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

<p>Group 1, 2, and 13 to 17 (B)</p> Signup and view all the answers

What is the range of atomic numbers for the Lanthanides?

<p>58 to 71 (D)</p> Signup and view all the answers

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

<p>Defect of the long form of the periodic table (D)</p> Signup and view all the answers

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

<p>[He]2, [Ne]10, [Ar]18, [Kr]36, [Xe]54, [Rn]86 (B)</p> Signup and view all the answers

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

<p>They are all transition elements (D)</p> Signup and view all the answers

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