Questions and Answers
What is the basic theme of organization in the periodic table?
The basic theme of organization in the periodic table is to classify the elements in periods and groups as per their properties.
Which important property did Mendeleev use to classify the elements in his periodic table?
Mendeleev organized the components in his periodic table according to the order of their atomic weight.
Match Mendeleev's Periodic Law with the Modern Periodic Law.
Mendeleev’s Periodic Law = The physical and chemical properties of elements are periodic functions of their atomic weights. Modern Periodic Law = The physical and chemical properties of elements are periodic functions of their atomic numbers.
Justify that the sixth period of the periodic table should have 32 elements based on quantum numbers.
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In terms of period and group, where would you locate the element with Z = 114?
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What is the atomic number of the element given that it is in the 3rd period of the periodic table and in the 17th group?
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Study Notes
Organization of the Periodic Table
- Classification in the periodic table organizes elements into periods and groups based on shared properties.
- Elements in the same group exhibit similar chemical and physical behaviors, facilitating the study of their compounds.
Mendeleev's Classification Method
- Mendeleev classified elements primarily by their atomic weight, arranging them into groups and periods.
- He grouped elements with similar properties together despite occasional deviations from strict atomic weight order.
- Example: Iodine (lower atomic mass) was placed after Tellurium (higher atomic mass) due to property similarities.
Mendeleev’s vs. Modern Periodic Law
- Mendeleev’s Periodic Law: Properties of elements are periodic functions of their atomic weights.
- Modern Periodic Law: Properties are periodic functions of atomic numbers, aligning more accurately with observed element behaviors.
Sixth Period Elements
- The sixth period corresponds to the principal quantum number (n) value of 6.
- Azimuthal quantum number (l) can take values from 0 to 4, filling the 6s, 4f, 5d, and 6p subshells.
- Total types of orbitals filled:
- 6s: 1 orbital,
- 4f: 7 orbitals,
- 5d: 5 orbitals,
- 6p: 3 orbitals.
- Total orbitals available: 16 (1 + 7 + 5 + 3).
- Maximum electron capacity: 32 electrons (as each orbital holds 2 electrons).
Element with Z = 114
- Element with atomic number 114 is found in the seventh period of the periodic table.
- The classification by group includes:
- 2 s-block elements (Z = 87, 88),
- 14 f-block elements (starting from Z = 89 to Z = 103),
- 10 d-block elements (Z = 89, 104 to 112),
- 6 p-block elements (Z = 113 to Z = 118).
- Z = 114 is located in the fourth group of the p-block.
Determining Atomic Number from Period and Group
- For elements in the third period, the principal quantum number (n) is 3.
- Elements in the 17th group are known as halogens, and the prominent element in the third period is Chlorine (Cl).
- Atomic number for the third-period element in the 17th group is 17.
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Description
Explore NCERT Solutions for Class 11 Chemistry focusing on Chapter 3, which deals with the classification of elements and the periodicity of their properties. This chapter provides insights into how elements are organized within the periodic table based on their characteristics and similarities. Ideal for students seeking to enhance their understanding of elemental classification.
