ACS GENERAL CHEMISTRY EXAM 2026 WITH
QUESTIONS AND VERIFIED ANSWERS||
ALREADY GRADED A+|| LATEST UPDATE 2026
What are the allowed values of the principal quantum number (n)? - ANSWER-
Any integer from 1 to infinity.
What are the allowed values of the azimuthal quantum number (l)? - ANSWER-
Values from 0 up to n-1.
What are the allowed values of the magnetic quantum number (m_l)? -
ANSWER-Values from -l to +l.
What are the allowed values of the spin quantum number (m_s)? - ANSWER-
+1/2 or -1/2.
Which set of quantum numbers is incorrect: (A) n=3, l=2, m_l=-1, m_s=+1/2? -
ANSWER-Correct set.
Which set of quantum numbers is incorrect: (B) n=4, l=0, m_l=-1, m_s=+1/2? -
ANSWER-Incorrect because m_l=-1 is not allowed for l=0.
Which set of quantum numbers is incorrect: (C) n=3, l=1, m_l=-1, m_s=+1/2? -
ANSWER-Correct set.
,Which set of quantum numbers is incorrect: (D) n=4, l=0, m_l=0, m_s=+1/2? -
ANSWER-Correct set.
What type of electron is described by the quantum numbers n=3, l=2, m_l=1,
m_s=+1/2? - ANSWER-3d electron.
What is the electron configuration of the valence electrons for a ground-state Ge
atom? - ANSWER-4s²4p².
What is the atomic number of Ge? - ANSWER-32.
What is the ground state electron configuration for the Zr²⁺ ion? - ANSWER-
[Kr] 4d².
What happens to the electron configuration when forming cations? - ANSWER-
Electrons in the highest energy level are removed first.
Which atom or ion is paramagnetic in the ground state? - ANSWER-Fe³⁺ (it has
unpaired electrons).
Which atom experiences the greatest effective nuclear charge (Z_eff) for a 2p
electron? - ANSWER-F (Fluorine).
What is the definition of effective nuclear charge (Z_eff)? - ANSWER-The net
positive charge experienced by valence electrons.
What is the relationship between the principal quantum number (n) and energy
level designation? - ANSWER-The principal quantum number indicates the
energy level of the electron.
, What is the formula to calculate the average atomic mass? - ANSWER-The
average atomic mass is calculated using the formula: (mass1 * %abundance1 +
mass2 * %abundance2) / 100%.
What is the charge of an ion with 25 protons and 22 electrons? - ANSWER-The
ion has a charge of +3.
What is the definition of relative abundance? - ANSWER-The proportion of a
particular isotope in a mixture of isotopes.
How do you calculate a weighted average? - ANSWER-By multiplying each
value by its relative abundance and summing the results.
What is the average atomic mass of thallium? - ANSWER-204.4 amu.
What does the formula X2O3 indicate about element X? - ANSWER-Element
X has a +3 charge in its ionic form.
Which group number contains the most diatomic molecular elements? -
ANSWER-Group 17.
What is the classification of sulfur? - ANSWER-Nonmetal.
What is the formula for the chloride of element X if X2O3 is its oxide? -
ANSWER-XCl3.
What pairs represent isotopes? - ANSWER-Isotopes have the same number of
protons but different numbers of neutrons.
How many neutrons are in Carbon-12? - ANSWER-6 neutrons.
QUESTIONS AND VERIFIED ANSWERS||
ALREADY GRADED A+|| LATEST UPDATE 2026
What are the allowed values of the principal quantum number (n)? - ANSWER-
Any integer from 1 to infinity.
What are the allowed values of the azimuthal quantum number (l)? - ANSWER-
Values from 0 up to n-1.
What are the allowed values of the magnetic quantum number (m_l)? -
ANSWER-Values from -l to +l.
What are the allowed values of the spin quantum number (m_s)? - ANSWER-
+1/2 or -1/2.
Which set of quantum numbers is incorrect: (A) n=3, l=2, m_l=-1, m_s=+1/2? -
ANSWER-Correct set.
Which set of quantum numbers is incorrect: (B) n=4, l=0, m_l=-1, m_s=+1/2? -
ANSWER-Incorrect because m_l=-1 is not allowed for l=0.
Which set of quantum numbers is incorrect: (C) n=3, l=1, m_l=-1, m_s=+1/2? -
ANSWER-Correct set.
,Which set of quantum numbers is incorrect: (D) n=4, l=0, m_l=0, m_s=+1/2? -
ANSWER-Correct set.
What type of electron is described by the quantum numbers n=3, l=2, m_l=1,
m_s=+1/2? - ANSWER-3d electron.
What is the electron configuration of the valence electrons for a ground-state Ge
atom? - ANSWER-4s²4p².
What is the atomic number of Ge? - ANSWER-32.
What is the ground state electron configuration for the Zr²⁺ ion? - ANSWER-
[Kr] 4d².
What happens to the electron configuration when forming cations? - ANSWER-
Electrons in the highest energy level are removed first.
Which atom or ion is paramagnetic in the ground state? - ANSWER-Fe³⁺ (it has
unpaired electrons).
Which atom experiences the greatest effective nuclear charge (Z_eff) for a 2p
electron? - ANSWER-F (Fluorine).
What is the definition of effective nuclear charge (Z_eff)? - ANSWER-The net
positive charge experienced by valence electrons.
What is the relationship between the principal quantum number (n) and energy
level designation? - ANSWER-The principal quantum number indicates the
energy level of the electron.
, What is the formula to calculate the average atomic mass? - ANSWER-The
average atomic mass is calculated using the formula: (mass1 * %abundance1 +
mass2 * %abundance2) / 100%.
What is the charge of an ion with 25 protons and 22 electrons? - ANSWER-The
ion has a charge of +3.
What is the definition of relative abundance? - ANSWER-The proportion of a
particular isotope in a mixture of isotopes.
How do you calculate a weighted average? - ANSWER-By multiplying each
value by its relative abundance and summing the results.
What is the average atomic mass of thallium? - ANSWER-204.4 amu.
What does the formula X2O3 indicate about element X? - ANSWER-Element
X has a +3 charge in its ionic form.
Which group number contains the most diatomic molecular elements? -
ANSWER-Group 17.
What is the classification of sulfur? - ANSWER-Nonmetal.
What is the formula for the chloride of element X if X2O3 is its oxide? -
ANSWER-XCl3.
What pairs represent isotopes? - ANSWER-Isotopes have the same number of
protons but different numbers of neutrons.
How many neutrons are in Carbon-12? - ANSWER-6 neutrons.
