ACS GENERAL CHEMISTRY EXAM WITH
VERIFIED QUESTIONS AND ANSWERS||
GAUARNTEED PASS|| LATEST VERSION 2026
What is the significance of the number of neutrons in isotopes? - ANSWER-The
number of neutrons determines the isotope's mass and stability.
What does a nuclear symbol represent? - ANSWER-A nuclear symbol
represents the mass number and atomic number of an element.
How do you determine the number of neutrons from a nuclear symbol? -
ANSWER-Subtract the atomic number from the mass number.
What is the mass number of an isotope if it has 22 protons and 25 neutrons? -
ANSWER-The mass number is 47.
What happens to the number of electrons in an atom when it becomes a positive
ion? - ANSWER-The number of electrons decreases.
What is the atomic mass of chlorine based on its isotopes? - ANSWER-The
average atomic mass of chlorine is approximately 35.45 amu.
What is the charge of an atom that has equal numbers of protons and electrons?
- ANSWER-The atom is neutral.
What is the atomic number of an element with 19 protons? - ANSWER-The
atomic number is 19.
,What is the relationship between protons and electrons in a neutral atom? -
ANSWER-In a neutral atom, the number of protons equals the number of
electrons.
What is the charge of an ion with 18 electrons and an atomic number of 19? -
ANSWER-The charge is +1.
What is the definition of relative abundance? - ANSWER-The percentage of a
particular isotope in a mixture of isotopes.
How is the average atomic mass calculated? - ANSWER-It is a weighted
average based on the relative abundances of each isotope.
What is the average atomic mass of thallium? - ANSWER-204.4 amu.
Which isotope of thallium is less abundant, 203Tl or 205Tl? - ANSWER-203Tl
is less abundant than 205Tl.
What is the relationship between the principal quantum number (n) and energy
level designation? - ANSWER-The value of n indicates the energy level of the
electron.
What is the definition of valence electrons? - ANSWER-Electrons in the
outermost energy level.
What is the core notation for a ground-state Ge atom? - ANSWER-[Ar] 4s² 3d¹⁰
4p².
What is the significance of Hund's rule in electron configuration? - ANSWER-
Each orbital is half-filled before any orbital is fully filled.
,What happens to the electron configuration when forming cations? - ANSWER-
Electrons in the highest energy level are removed first.
What is the electron configuration for Sc³⁺? - ANSWER-[Ar].
What is the electron configuration for Zn²⁺? - ANSWER-[Ar] 3d¹⁰.
What is the electron configuration for Ca? - ANSWER-[Ar] 4s².
What is the electron configuration for the ground state of Zr? - ANSWER-[Kr]
5s² 4d².
Which quantum number describes the shape of an orbital? - ANSWER-The
azimuthal quantum number (l).
What is the maximum number of electrons in a given shell? - ANSWER-2n²,
where n is the principal quantum number.
What is the significance of the magnetic quantum number (m_l)? - ANSWER-It
specifies the orientation of the orbital in space.
What does the term 'ground state' refer to in atomic structure? - ANSWER-The
lowest energy state of an atom.
What is the electron configuration for a neutral Zr atom? - ANSWER-[Kr] 5s²
4d².
What is the relationship between the azimuthal quantum number (l) and orbital
types? - ANSWER-l=0 is s, l=1 is p, l=2 is d, l=3 is f.
, What do valence electrons experience due to inner electrons? - ANSWER-
Valence electrons do not experience the entire nuclear charge due to shielding
by inner electrons.
What is the equation for effective nuclear charge (Zerr)? - ANSWER-Zerr =
Znuclear - shielding
What happens to the effective nuclear charge (Zerr) as you move across a
period? - ANSWER-Zerr increases as you move from left to right across a
period.
Which atom has the largest effective nuclear charge (Zerr) in the second period?
- ANSWER-Fluorine (F) has the largest Zerr.
Which atom has the largest atomic radius among K, I, Rb, and Sn? - ANSWER-
Rubidium (Rb) has the largest atomic radius.
What is the trend for atomic radius as you move down a group? - ANSWER-
Atomic radius increases as you move down a group.
What is the trend for atomic radius as you move across a period? - ANSWER-
Atomic radius decreases as you move from left to right across a period.
What happens to the size of an atom when it loses electrons? - ANSWER-The
atom becomes smaller when it loses electrons, forming a cation.
What happens to the size of an atom when it gains electrons? - ANSWER-The
atom becomes larger when it gains electrons, forming an anion.
How does the size of Li compare to Li+? - ANSWER-Li is larger than Li+.
VERIFIED QUESTIONS AND ANSWERS||
GAUARNTEED PASS|| LATEST VERSION 2026
What is the significance of the number of neutrons in isotopes? - ANSWER-The
number of neutrons determines the isotope's mass and stability.
What does a nuclear symbol represent? - ANSWER-A nuclear symbol
represents the mass number and atomic number of an element.
How do you determine the number of neutrons from a nuclear symbol? -
ANSWER-Subtract the atomic number from the mass number.
What is the mass number of an isotope if it has 22 protons and 25 neutrons? -
ANSWER-The mass number is 47.
What happens to the number of electrons in an atom when it becomes a positive
ion? - ANSWER-The number of electrons decreases.
What is the atomic mass of chlorine based on its isotopes? - ANSWER-The
average atomic mass of chlorine is approximately 35.45 amu.
What is the charge of an atom that has equal numbers of protons and electrons?
- ANSWER-The atom is neutral.
What is the atomic number of an element with 19 protons? - ANSWER-The
atomic number is 19.
,What is the relationship between protons and electrons in a neutral atom? -
ANSWER-In a neutral atom, the number of protons equals the number of
electrons.
What is the charge of an ion with 18 electrons and an atomic number of 19? -
ANSWER-The charge is +1.
What is the definition of relative abundance? - ANSWER-The percentage of a
particular isotope in a mixture of isotopes.
How is the average atomic mass calculated? - ANSWER-It is a weighted
average based on the relative abundances of each isotope.
What is the average atomic mass of thallium? - ANSWER-204.4 amu.
Which isotope of thallium is less abundant, 203Tl or 205Tl? - ANSWER-203Tl
is less abundant than 205Tl.
What is the relationship between the principal quantum number (n) and energy
level designation? - ANSWER-The value of n indicates the energy level of the
electron.
What is the definition of valence electrons? - ANSWER-Electrons in the
outermost energy level.
What is the core notation for a ground-state Ge atom? - ANSWER-[Ar] 4s² 3d¹⁰
4p².
What is the significance of Hund's rule in electron configuration? - ANSWER-
Each orbital is half-filled before any orbital is fully filled.
,What happens to the electron configuration when forming cations? - ANSWER-
Electrons in the highest energy level are removed first.
What is the electron configuration for Sc³⁺? - ANSWER-[Ar].
What is the electron configuration for Zn²⁺? - ANSWER-[Ar] 3d¹⁰.
What is the electron configuration for Ca? - ANSWER-[Ar] 4s².
What is the electron configuration for the ground state of Zr? - ANSWER-[Kr]
5s² 4d².
Which quantum number describes the shape of an orbital? - ANSWER-The
azimuthal quantum number (l).
What is the maximum number of electrons in a given shell? - ANSWER-2n²,
where n is the principal quantum number.
What is the significance of the magnetic quantum number (m_l)? - ANSWER-It
specifies the orientation of the orbital in space.
What does the term 'ground state' refer to in atomic structure? - ANSWER-The
lowest energy state of an atom.
What is the electron configuration for a neutral Zr atom? - ANSWER-[Kr] 5s²
4d².
What is the relationship between the azimuthal quantum number (l) and orbital
types? - ANSWER-l=0 is s, l=1 is p, l=2 is d, l=3 is f.
, What do valence electrons experience due to inner electrons? - ANSWER-
Valence electrons do not experience the entire nuclear charge due to shielding
by inner electrons.
What is the equation for effective nuclear charge (Zerr)? - ANSWER-Zerr =
Znuclear - shielding
What happens to the effective nuclear charge (Zerr) as you move across a
period? - ANSWER-Zerr increases as you move from left to right across a
period.
Which atom has the largest effective nuclear charge (Zerr) in the second period?
- ANSWER-Fluorine (F) has the largest Zerr.
Which atom has the largest atomic radius among K, I, Rb, and Sn? - ANSWER-
Rubidium (Rb) has the largest atomic radius.
What is the trend for atomic radius as you move down a group? - ANSWER-
Atomic radius increases as you move down a group.
What is the trend for atomic radius as you move across a period? - ANSWER-
Atomic radius decreases as you move from left to right across a period.
What happens to the size of an atom when it loses electrons? - ANSWER-The
atom becomes smaller when it loses electrons, forming a cation.
What happens to the size of an atom when it gains electrons? - ANSWER-The
atom becomes larger when it gains electrons, forming an anion.
How does the size of Li compare to Li+? - ANSWER-Li is larger than Li+.
