ACS CHEMISTRY FINAL EXAM WITH
VERIFIED QUESTIONS AND
ANSWERS 2026
Layout of an element (mass # & atomic #) - ANSWER-
atomic number = - ANSWER-# of protons
mass number = - ANSWER-# of protons + neutrons
the number of protons in a neutral atom will equal the - ANSWER-# of electrons
how to find the correct number of neutrons - ANSWER-mass number - atomic number
Forms of the same elements that differ in amount of neutrons - ANSWER-isotopes
What particle, if lost from the nucleus, would NOT cause a change in the atomic number? - ANSWER-a
neutron because it has no charge
When alpha particles were shot at a metal foil target, most passed through without deflections, while
others deflected at large angles. What did this suggest to Rutherford? - ANSWER-that the atoms of the
metal were mostly empty space, while the nucleus consisted of most of the mass which included highly
condensed positive particles (which caused the deflection).
An atom has a valence shell configuration of 1s1. To which group of elements on the periodic table does
it belong? - ANSWER-IA
alkali metals
,electromagnetic spectrum - ANSWER-
The greater the wavelength of a photon..? - ANSWER-the lower its frequency
The greater the frequency of a photon...? - ANSWER-the shorter its wavelength
Light energy formula - ANSWER-
What does C in the light energy formula represent? - ANSWER-
Give the ground-state electron configuration of an atom in the second period - ANSWER-1s2 2s1
Electrons configuration rule that states electrons do not pair until they have to. (put one electrons in
each electron domain then pair up) - ANSWER-Hund's rule
An experimental phenomena associated with atoms having unpaired electrons - which states such
substances are attracted to magnetic fields - ANSWER-Paramagnetism
Which drop in energy level results in the greatest emission of energy? - ANSWER-n=2 to n=1
quantum numbers - ANSWER-
What do the 4 quantum numbers stand for? - ANSWER-n = energy level
l = (n-1)
ml -l to l
mn 1/2 or -1/2 (spin)
, List the quantum numbers for the s, p, d, and f orbitals - ANSWER-s 1,0,0
p 2, 1, -1-0-1
d 3, 2, -2--1-0-1-2
f 4, 3 -3--2--1-0-1-2-3
Py orbital - ANSWER-
Which element is represented by X - ANSWER-Chromium
What two subatomic particles have the most mass, but occupy very little of the volume of an atom -
ANSWER-protons and neutrons
Define Isoelectronic - ANSWER-Having the same amount of electrons
How does a sodium ion differ from a sodium atom? - ANSWER-the sodium ion has fewer electrons
two or more compounds with the same formula but a different arrangement of atoms in the molecule
and different properties - ANSWER-isomer
two or more different physical forms in which an element can exist. Graphite, charcoal, and diamond are
all ________ of carbon. - ANSWER-allotropes
What makes up an alpha particle? - ANSWER-2 protons and 2 neutrons
What did Millikan discover from his oil drop experiments? - ANSWER-the magnitude of the charge on an
electron
VERIFIED QUESTIONS AND
ANSWERS 2026
Layout of an element (mass # & atomic #) - ANSWER-
atomic number = - ANSWER-# of protons
mass number = - ANSWER-# of protons + neutrons
the number of protons in a neutral atom will equal the - ANSWER-# of electrons
how to find the correct number of neutrons - ANSWER-mass number - atomic number
Forms of the same elements that differ in amount of neutrons - ANSWER-isotopes
What particle, if lost from the nucleus, would NOT cause a change in the atomic number? - ANSWER-a
neutron because it has no charge
When alpha particles were shot at a metal foil target, most passed through without deflections, while
others deflected at large angles. What did this suggest to Rutherford? - ANSWER-that the atoms of the
metal were mostly empty space, while the nucleus consisted of most of the mass which included highly
condensed positive particles (which caused the deflection).
An atom has a valence shell configuration of 1s1. To which group of elements on the periodic table does
it belong? - ANSWER-IA
alkali metals
,electromagnetic spectrum - ANSWER-
The greater the wavelength of a photon..? - ANSWER-the lower its frequency
The greater the frequency of a photon...? - ANSWER-the shorter its wavelength
Light energy formula - ANSWER-
What does C in the light energy formula represent? - ANSWER-
Give the ground-state electron configuration of an atom in the second period - ANSWER-1s2 2s1
Electrons configuration rule that states electrons do not pair until they have to. (put one electrons in
each electron domain then pair up) - ANSWER-Hund's rule
An experimental phenomena associated with atoms having unpaired electrons - which states such
substances are attracted to magnetic fields - ANSWER-Paramagnetism
Which drop in energy level results in the greatest emission of energy? - ANSWER-n=2 to n=1
quantum numbers - ANSWER-
What do the 4 quantum numbers stand for? - ANSWER-n = energy level
l = (n-1)
ml -l to l
mn 1/2 or -1/2 (spin)
, List the quantum numbers for the s, p, d, and f orbitals - ANSWER-s 1,0,0
p 2, 1, -1-0-1
d 3, 2, -2--1-0-1-2
f 4, 3 -3--2--1-0-1-2-3
Py orbital - ANSWER-
Which element is represented by X - ANSWER-Chromium
What two subatomic particles have the most mass, but occupy very little of the volume of an atom -
ANSWER-protons and neutrons
Define Isoelectronic - ANSWER-Having the same amount of electrons
How does a sodium ion differ from a sodium atom? - ANSWER-the sodium ion has fewer electrons
two or more compounds with the same formula but a different arrangement of atoms in the molecule
and different properties - ANSWER-isomer
two or more different physical forms in which an element can exist. Graphite, charcoal, and diamond are
all ________ of carbon. - ANSWER-allotropes
What makes up an alpha particle? - ANSWER-2 protons and 2 neutrons
What did Millikan discover from his oil drop experiments? - ANSWER-the magnitude of the charge on an
electron
