20 Questions
What is the ionic radius?
The radius of a monatomic ion in an ionic crystal structure
How are ions treated in terms of their boundaries?
As hard spheres with radii
What happens to the size of an ion when it loses an electron to form a cation?
The radius of the ion gets smaller
How do ionic radii behave on descending a group in the periodic table?
They increase
What parameter can cause variation in ionic radius values?
Coordination number and spin state
An ion in a high-spin state will be ______ than the same ion in a low-spin state
larger
Ionic radii are typically given in units of either picometers (pm) or angstroms (Å), with 1 Å = 100 pm. Typical values range from 31 pm (0.3 Å) to over 200 pm (2 Å). The concept can be extended to solvated ions in liquid solutions taking into consideration the ______ shell.
solvation
When an atom loses an electron to form a cation, the other electrons are more attracted to the nucleus, and the radius of the ion gets ______.
smaller
Ionic size (for the same ion) also increases with increasing ______ number
coordination
Ionic radii increase on descending a ______.
group
Explain the concept of ionic radius and how it is used in an ionic crystal structure.
Ionic radius is the radius of a monatomic ion in an ionic crystal structure. It is used to represent the distance between ions in a crystal lattice by considering the sum of ionic radii of the cation and anion as if they were hard spheres.
What factors can cause variation in ionic radius values?
Ionic radius values can vary with coordination number, spin state, and other parameters.
How do ionic radii behave on descending a group in the periodic table?
Ionic radii increase on descending a group.
Explain how the size of an ion changes when it loses an electron to form a cation.
When an atom loses an electron to form a cation, the radius of the ion gets smaller as the other electrons are more attracted to the nucleus.
In what units are ionic radii typically given, and what are the typical ranges for these values?
Ionic radii are typically given in units of either picometers (pm) or angstroms (Å), with 1 Å = 100 pm. Typical values range from 31 pm (0.3 Å) to over 200 pm (2 Å).
Explain how the ionic radius of an ion can vary based on its electric charge and other parameters.
The ionic radius of an ion can vary based on its electric charge. When an atom loses an electron to form a cation, the other electrons are more attracted to the nucleus, causing the radius of the ion to decrease. Conversely, when an electron is added to an atom to form an anion, the added electron increases the size of the electron cloud by interelectronic repulsion, leading to an increase in the radius of the ion. Additionally, the ionic radius varies with coordination number, spin state, and other parameters.
What are the typical units for expressing ionic radii and what are the typical ranges for these values?
Ionic radii are typically given in units of either picometers (pm) or angstroms (Å), with 1 Å = 100 pm. Typical values for ionic radii range from 31 pm (0.3 Å) to over 200 pm (2 Å).
How do ionic radii behave in terms of periodic trends?
Similar to other types of atomic radius, ionic radii increase on descending a group in the periodic table.
How does the size of an ion change with increasing coordination number?
Ionic size for the same ion increases with increasing coordination number.
What factors can cause variation in ionic radius values?
The ionic radius values can vary based on coordination number, spin state, and other parameters.
Test your knowledge about ionic radius, the concept of the radius of a monatomic ion in an ionic crystal structure, typically given in units of picometers or angstroms.
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