Ionic Radii MDCAT Quiz: from that of neutral atoms. Ionic radius refers to the distance from the nucleus to the outermost electron in an ion. Being able to predict how ionic radii vary when atoms lose or gain electrons is crucial in answering many types of questions in MDCAT Quiz, as this helps to estimate the behavior of ions in a chemical reaction and on properties such as ionization and lattice energies.
H2: Trends in Ionic Radii
Ionic radii depend on the charge and size of the ion. When an atom loses an electron to form a cation, its ionic radius decreases. The reason for this is that when an electron is lost, electron-electron repulsion is reduced, and the remaining electrons are pulled closer to the nucleus because the effective nuclear charge is higher. On the other hand, when an atom gains an electron to form an anion, the ionic radius increases. This is because the addition of an electron results in increased electron-electron repulsion, which causes the electron cloud to expand. The trends for ionic radii also show periodic trends—cations are smaller than their parent atoms, and anions are larger than their parent atoms.
H3: Ionic Radii Quiz
The MDCAT Quiz on ionic radii will test students’ understanding of how the size of an ion compares to its neutral atom and how the charge affects the ionic radius. Questions may involve predicting the ionic radii of different ions, comparing the radii of cations and anions within the same group or period, and explaining the reasons for these differences. This kind of practice helps students develop a deep understanding of ionic radii and apply this knowledge confidently in the MDCAT exam.
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H3: Free Flashcard for Ionic Radii
Mastery of the concept of ionic radii by MDCAT students can be assisted with the Ionic Radii Flashcards for this topic. The flashcards summarize how ionic radii change with changes in charge on the ion, as well as periodic trends in ionic size. Going over these flashcards on a daily basis will solidify important concepts and enhance memorization. This tool enables quick recall of important information and leaves no stone unturned in preparing students for any type of question related to ionic radii that may appear on the MDCAT exam, tackling them with much ease.
The ionic radius of a cation is ________ than the atomic radius of the neutral atom.
smaller
The ionic radius of an anion is ________ than the atomic radius of the neutral atom.
larger
The ionic radius of a potassium ion (K⁺) is ________ than that of a potassium atom (K).
smaller
Among Na⁺, Mg²⁺, and Al³⁺, the ion with the smallest ionic radius is ________.
Al³⁺
The ionic radius of a chloride ion (Cl⁻) is ________ than that of a sodium ion (Na⁺).
larger
In isoelectronic ions, the ion with the ________ charge has the smallest ionic radius.
highest
The ionic radius of an anion is typically ________ than that of the corresponding cation.
larger
The ionic radii of transition metal ions generally ________ as the charge increases.
decrease
The ionic radius of a calcium ion (Ca²⁺) is ________ than that of a sodium ion (Na⁺).
smaller
In a group of elements, ionic radius ________ as you move down the group.
increases
The ionic radius of an oxygen ion (O²⁻) is ________ than that of a fluoride ion (F⁻).
larger
A higher positive charge on a cation generally leads to a ________ ionic radius.
smaller
For isoelectronic ions, the ionic radius ________ as the nuclear charge increases.
decreases
The ionic radius of the lithium ion (Li⁺) is ________ than that of the sodium ion (Na⁺).
smaller
Among the ions Li⁺, Na⁺, K⁺, and Rb⁺, the ion with the largest ionic radius is ________.
Rb⁺
The ionic radius of an ion decreases as its nuclear charge ________.
increases
The ionic radius of an ion increases as its number of electrons ________.
increases
In the case of anions, the ionic radius typically ________ as the number of electrons increases.
increases
The ionic radius of a nitrogen ion (N³⁻) is ________ than that of an oxygen ion (O²⁻).
larger
The ionic radii of halide ions (Cl⁻, Br⁻, I⁻) ________ as the atomic number increases.
increase
Among the ions S²⁻, Cl⁻, and P³⁻, the ion with the largest ionic radius is ________.
P³⁻
A larger ionic radius usually corresponds to a ________ ionic charge.
lower
The ionic radius of an ion is influenced by the number of ________ in its electron shell.
electrons
The ionic radius of an ion is affected by its ________ number.
nuclear
A cation with a higher charge typically has a ________ ionic radius than a cation with a lower charge.
smaller
The ionic radius of an ion is generally larger for ________ ions.
anions
Among the ions K⁺, Ca²⁺, and Fe³⁺, the ion with the smallest ionic radius is ________.
Fe³⁺
The ionic radius of an anion increases as the ________ of the atom increases.
electron affinity
The ionic radius of an ion depends on its ________ charge and the size of the nucleus.
ionic
The ionic radius of a metal ion generally ________ as the number of protons increases.
decreases
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