SCH4U STUDY GUIDE 2026 ACTUAL
QUESTIONS WITH SOLUTIONS GRADED A+
● atomic radius. Answer: measure of the size of the elements atoms
● electron configuration. Answer: a shorthand notation that shows the
number and arrangement of electrons in an atom's orbitals
● orbital. Answer: solved wave functions that describe a region of
probable location of electrons
● excited state. Answer: any quantum state of the system that has a
higher energy than the ground state
● ground state. Answer: the most stable energy state
● ionization energy. Answer: the energy required to remove the most
loosely bound electron of an isolated gaseous atom to form a cation
● valence electrons. Answer: electrons that occupy the outer occupied
energy level of an atom in its ground state
, ● isotope. Answer: two or more forms of the same element that contain
an equal number or protons but a different number of neutrons
● mass number. Answer: the number or protons plus the number of
neutrons in the nucleus of an atom
● electronegativity. Answer: a relative measure of an atom's ability to
attract shared electrons in a chemical bond
● principal quantum number. Answer: a positive whole number that
indicates the energy level and relative size of an atomic orbital
● quantum number. Answer: a number that occurs in the theoretical
expression
● isoelectronic. Answer: having the same number of electrons
● expanded valence. Answer: the valence energy level of a central atom,
where the valence energy level has more than eight electrons
● coordinate covalent bond. Answer: a covalent bond in which one atom
contributes both electrons to the shared electron pair bond
QUESTIONS WITH SOLUTIONS GRADED A+
● atomic radius. Answer: measure of the size of the elements atoms
● electron configuration. Answer: a shorthand notation that shows the
number and arrangement of electrons in an atom's orbitals
● orbital. Answer: solved wave functions that describe a region of
probable location of electrons
● excited state. Answer: any quantum state of the system that has a
higher energy than the ground state
● ground state. Answer: the most stable energy state
● ionization energy. Answer: the energy required to remove the most
loosely bound electron of an isolated gaseous atom to form a cation
● valence electrons. Answer: electrons that occupy the outer occupied
energy level of an atom in its ground state
, ● isotope. Answer: two or more forms of the same element that contain
an equal number or protons but a different number of neutrons
● mass number. Answer: the number or protons plus the number of
neutrons in the nucleus of an atom
● electronegativity. Answer: a relative measure of an atom's ability to
attract shared electrons in a chemical bond
● principal quantum number. Answer: a positive whole number that
indicates the energy level and relative size of an atomic orbital
● quantum number. Answer: a number that occurs in the theoretical
expression
● isoelectronic. Answer: having the same number of electrons
● expanded valence. Answer: the valence energy level of a central atom,
where the valence energy level has more than eight electrons
● coordinate covalent bond. Answer: a covalent bond in which one atom
contributes both electrons to the shared electron pair bond
