High School Chemistry
2026 | Study Guide,
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Exam Review
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Updated 2026 Questions and Answers
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, Hund's rule Orbitals of = energy are each occupied by one electron before any orbital is
occupied by a 2nd electron and all electrons in single occupied orbitals must
have the same spin state
Isotope each of two or more forms of the same element that contain equal numbers of
protons but different numbers of neutrons in their nuclei, and hence differ in
relative atomic mass but not in chemical properties; in particular, a radioactive
form of an element.
Photon a particle representing a quantum of light or other electromagnetic radiation. A
photon carries energy proportional to the radiation frequency but has zero rest
mass.
Extensive Properties a property that changes when the size of the sample changes. Examples are mass,
volume, length, and total charge.
Intensive Properties doesn't change when you take away some of the sample.
Covalent Bonding is a chemical bond that involves the sharing of electron pairs between atoms.
Lattice Energy a measure of the energy contained in the crystal lattice of a compound, equal to
the energy that would be released if the component ions were brought together
from infinity.
Molecule a group of atoms bonded together, representing the smallest fundamental unit of
a chemical compound that can take part in a chemical reaction.
Electron -1
Proton +1
2026 | Study Guide,
Practice Questions &
Exam Review
|Graded A+ | Guaranteed
success|
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, Hund's rule Orbitals of = energy are each occupied by one electron before any orbital is
occupied by a 2nd electron and all electrons in single occupied orbitals must
have the same spin state
Isotope each of two or more forms of the same element that contain equal numbers of
protons but different numbers of neutrons in their nuclei, and hence differ in
relative atomic mass but not in chemical properties; in particular, a radioactive
form of an element.
Photon a particle representing a quantum of light or other electromagnetic radiation. A
photon carries energy proportional to the radiation frequency but has zero rest
mass.
Extensive Properties a property that changes when the size of the sample changes. Examples are mass,
volume, length, and total charge.
Intensive Properties doesn't change when you take away some of the sample.
Covalent Bonding is a chemical bond that involves the sharing of electron pairs between atoms.
Lattice Energy a measure of the energy contained in the crystal lattice of a compound, equal to
the energy that would be released if the component ions were brought together
from infinity.
Molecule a group of atoms bonded together, representing the smallest fundamental unit of
a chemical compound that can take part in a chemical reaction.
Electron -1
Proton +1
