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Questions and Answers
Which of the following ions has the smallest ionic size?
Which of the following ions has the smallest ionic size?
- Na +
- O 2−
- Mg 2+ (correct)
- B
What is the expected trend of atomic radius when going down the main sub-group from Li to Cs?
What is the expected trend of atomic radius when going down the main sub-group from Li to Cs?
- Continuous decrease
- A decrease followed by an increase
- Periodic one, an increase followed by a decrease
- Continuous increase (correct)
Which of the following has the largest ionic size?
Which of the following has the largest ionic size?
- Mg 2+
- F− (correct)
- Li−
- Al 3+
Which statement regarding lanthanides is false?
Which statement regarding lanthanides is false?
Which of these anions has the smallest ionic size?
Which of these anions has the smallest ionic size?
Which of the following correctly represents the order of ionic radii?
Which of the following correctly represents the order of ionic radii?
Which statement regarding the metallic character across a period is false?
Which statement regarding the metallic character across a period is false?
From which order of ionic radius is the following derived: Na+, Mg2+, Al3+, Si4+?
From which order of ionic radius is the following derived: Na+, Mg2+, Al3+, Si4+?
Which of the following does not correctly reflect basic nature of the oxides?
Which of the following does not correctly reflect basic nature of the oxides?
Which of the following statements about the ionic radii is accurate?
Which of the following statements about the ionic radii is accurate?
Who is known as the father of chemistry?
Who is known as the father of chemistry?
What is the total number of rare-earth elements?
What is the total number of rare-earth elements?
Which of the following elements is categorized as a metalloid?
Which of the following elements is categorized as a metalloid?
What block does an element with the electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹ belong to?
What block does an element with the electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹ belong to?
Which group of elements has an anomalous position in the periodic table?
Which group of elements has an anomalous position in the periodic table?
What is the screening effect of d-electrons comparable to?
What is the screening effect of d-electrons comparable to?
Which block does the element with atomic number 36 belong to?
Which block does the element with atomic number 36 belong to?
What element has an atomic mass of 19 and an atomic number of 9?
What element has an atomic mass of 19 and an atomic number of 9?
In which period is the element with atomic number 20 located?
In which period is the element with atomic number 20 located?
What characteristic electronic structure corresponds to transition elements?
What characteristic electronic structure corresponds to transition elements?
Which of these elements is not classified as a metal?
Which of these elements is not classified as a metal?
What type of elements does atomic numbers 10, 18, 36, 54, and 86 collectively represent?
What type of elements does atomic numbers 10, 18, 36, 54, and 86 collectively represent?
Which group of the periodic table contains only metals?
Which group of the periodic table contains only metals?
Which of the following elements has the following configuration: (n - 1)d^1-10 ns^0-2?
Which of the following elements has the following configuration: (n - 1)d^1-10 ns^0-2?
Aluminium is diagonally related to which element in the periodic table?
Aluminium is diagonally related to which element in the periodic table?
Which group in the periodic table is known to contain halogens?
Which group in the periodic table is known to contain halogens?
Which alkali metal ion has the lowest ionic mobility in aqueous solutions?
Which alkali metal ion has the lowest ionic mobility in aqueous solutions?
Which sequence correctly represents the increasing order of atomic radius for the elements Na, K, Mg, and Rb?
Which sequence correctly represents the increasing order of atomic radius for the elements Na, K, Mg, and Rb?
Which of these is the correct order of ionic radii for the isoelectronic species N³⁻, O²⁻, and F⁻?
Which of these is the correct order of ionic radii for the isoelectronic species N³⁻, O²⁻, and F⁻?
What explains why Al³⁺ has a lower ionic radius than Mg²⁺?
What explains why Al³⁺ has a lower ionic radius than Mg²⁺?
Which of the following correctly represents the increasing order of covalent character?
Which of the following correctly represents the increasing order of covalent character?
How are ionic radii related to effective nuclear charge?
How are ionic radii related to effective nuclear charge?
Which of these species has the largest ionic radius?
Which of these species has the largest ionic radius?
Which statement about ionic radii is true?
Which statement about ionic radii is true?
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Study Notes
Periodic Table Basics
- Element with atomic number 36 belongs to the p block of the periodic table.
- An element with atomic number 20 is located in period 4 of the periodic table.
Electronic Configuration
- The electronic structure
(n − 1)d¹⁻¹⁰ ns⁰⁻²is characteristic of transition elements.
Inert Gases
- Elements with atomic numbers 10, 18, 36, 54, and 86 are classified as inert gases.
Historical Figures in Chemistry
- Antoine Lavoisier is known as the "father of chemistry".
Screening Effect
- The screening effect of d-electrons is less than that of p-electrons.
Element Properties
- Group IIA of the periodic table contains only metals.
- Aluminium is diagonally related to elements in group IIIA of the periodic table.
Rare Earth Elements
- The total number of rare-earth elements is 14.
Ionic Radius and Trends
- The ionic radii of Na⁺, Mg²⁺, Al³⁺, and Si⁴⁺ decreases due to increasing nuclear charge.
- Isoelectronic species: N³⁻, O²⁻, and F⁻ have respective ionic radii of 1.71 Å, 1.40 Å, and 1.36 Å.
Charged Ions
- An element with atomic mass 19 and atomic number 9 is Fluorine (F).
- Al³⁺ has a lower ionic radius than Mg²⁺ due to higher nuclear charge.
Size Trends
- The atomic radius trend down a group generally shows a continuous increase.
- Increasing order of atomic radius for Na, K, Mg, Rb is: Mg < Na < K < Rb.
Covalent Character
- The correct sequence of increasing covalent character is: LiCl < NaCl < BeCl₂.
Ionic Mobility
- Li⁺ ion has the lowest ionic mobility in aqueous solutions among alkali metal ions.
Lanthanides
- Lanthanides can be separated using the ion exchange method.
Properties and Trends
- Going from left to right across a period, metallic character decreases and electronegativity increases.
- The size of atoms generally decreases for normal elements across a period.
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