Covalent Radii MDCAT Quiz: It forms covalent bonds with another atom. The covalent radius is defined as half the distance between the nuclei of two identical atoms that are covalently bonded. Understanding covalent radii is important to answer questions in the MDCAT Quiz because it helps in predicting bond lengths, molecular structures, and behavior of elements in covalent bonding.
H2: Trends in Covalent Radii
Covalent radii follow general trends in the periodic table. Going across a period from left to right, the covalent radius decreases. This occurs because the nuclear charge increases and, therefore, pulls the electrons toward the nucleus more strongly, making them closer to the nucleus. In effect, though the number of electrons increases, yet the size of the atom decreases. When you go down a group, the covalent radius increases. This results from the addition of electron shells, placing the outermost electrons farther from the nucleus and partially neutralizing increased nuclear charge. In addition, there is an increased shielding effect by the inner electron shells as you move down a group.
H3: Quiz on Covalent Radii
The MDCAT Quiz on covalent radii aims to test a student’s understanding of the concept of covalent radii in various contexts. Students will have the task of comparing covalent radii of atoms of different elements, making predictions of trends within periods and groups, and illustrating how covalent radii provide insight into bond formation and molecular geometry. These practice questions will make the student much more confident and prepared for the final MDCAT exam when answering questions that pertain to atomic and molecular size.
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H3: Free Flashcard for Covalent Radii
Free Flashcards on this topic will help MDCAT students reinforce their understanding of covalent radii. The flashcards summarize the major trends in covalent radii and their implications in chemical bonding. Going through the flashcards regularly will enable one to easily recall important concepts and apply them effectively during revision. This tool aids in solidifying the understanding of covalent radii and hence saves one from the agony of facing a question related to this topic in the MDCAT exam.
The covalent radius generally ________ as you move down a group in the periodic table.
increases
The covalent radius of an element increases as its ________ number increases.
atomic
The covalent radius of a non-metal is generally ________ than that of a metal in the same period.
smaller
Among the elements C, Si, and Ge, the element with the smallest covalent radius is ________.
C
The covalent radius of an element is ________ in the case of a highly electronegative element.
smaller
The covalent radius of an element typically ________ as its atomic number increases across a period.
decreases
The covalent radius of chlorine (Cl) is ________ than that of bromine (Br).
smaller
The covalent radius of fluorine (F) is ________ than that of iodine (I).
smaller
The covalent radius of an element is affected by the ________ of the element.
atomic number
The covalent radius of an element ________ as its electronegativity increases.
decreases
The covalent radius of an atom is directly related to the ________ of the atom.
size
The covalent radius of carbon (C) is ________ than that of sulfur (S).
smaller
The covalent radius of an element ________ when the element forms a cation.
decreases
The covalent radius of a halogen (e.g., Cl) is ________ compared to a noble gas (e.g., Ne).
larger
The covalent radius of an element increases as the ________ of the atom increases in a group.
number of shells
The covalent radius of oxygen (O) is ________ than that of nitrogen (N).
smaller
The covalent radius of an atom is generally ________ than its ionic radius.
larger
The covalent radius of an element ________ as the number of electron shells increases.
increases
The covalent radius of elements in period 3 ________ as you move from sodium (Na) to chlorine (Cl).
increases
The covalent radius of an element ________ as its atomic mass increases.
increases
The covalent radius of an atom typically ________ as its nuclear charge increases across a period.
decreases
The covalent radius of an atom is determined by the distance between the ________ in a covalent bond.
nuclei
The covalent radius of an element is smaller for a ________ charged atom than for a neutral atom.
positively
The covalent radius of elements with similar electron configurations will ________ each other.
resemble
The covalent radius of an atom increases as the ________ of the nucleus decreases.
charge
The covalent radius of a noble gas is ________ compared to a halogen in the same period.
smaller
The covalent radius of carbon (C) is ________ than that of oxygen (O).
smaller
The covalent radius of an atom increases as the ________ of the atom decreases.
effective nuclear charge
The covalent radius of an element is determined by the ________ of the atomic orbitals involved.
size
The covalent radius of an atom is typically measured in units of ________.
picometers
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