ACS Chemistry general Exam With
Possible Solutions | Latest Exam
2026-2027 | Graded A+
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
Periods vs Groups -ANSWER
Possible Solutions | Latest Exam
2026-2027 | Graded A+
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
Periods vs Groups -ANSWER
