ACS CHEMISTRY FINAL EXAM 2026
QUESTION AND ANSWERS
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 - answermass number - atomic number
Forms of the same elements that differ in amount of neutrons - answerisotopes
What particle, if lost from the nucleus, would NOT cause a change in the atomic
number? - answera 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?
- answerthat 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? - answerIA
alkali metals
electromagnetic spectrum - answer
The greater the wavelength of a photon..? - answerthe lower its frequency
The greater the frequency of a photon...? - answerthe 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 -
answer1s2 2s1
Electrons configuration rule that states electrons do not pair until they have to. (put one
electrons in each electron domain then pair up) - answerHund's rule
, An experimental phenomena associated with atoms having unpaired electrons - which
states such substances are attracted to magnetic fields - answerParamagnetism
Which drop in energy level results in the greatest emission of energy? - answern=2 to
n=1
quantum numbers - answer
What do the 4 quantum numbers stand for? - answern = 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 - answers 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 - answerChromium
What two subatomic particles have the most mass, but occupy very little of the volume
of an atom - answerprotons and neutrons
Define Isoelectronic - answerHaving the same amount of electrons
How does a sodium ion differ from a sodium atom? - answerthe 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 - answerisomer
two or more different physical forms in which an element can exist. Graphite, charcoal,
and diamond are all ________ of carbon. - answerallotropes
What makes up an alpha particle? - answer2 protons and 2 neutrons
What did Millikan discover from his oil drop experiments? - answerthe magnitude of the
charge on an electron
Periods vs Groups - answer
when an atom of an electropositive atom becomes an ion it..? - answerbecomes larger
QUESTION AND ANSWERS
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 - answermass number - atomic number
Forms of the same elements that differ in amount of neutrons - answerisotopes
What particle, if lost from the nucleus, would NOT cause a change in the atomic
number? - answera 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?
- answerthat 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? - answerIA
alkali metals
electromagnetic spectrum - answer
The greater the wavelength of a photon..? - answerthe lower its frequency
The greater the frequency of a photon...? - answerthe 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 -
answer1s2 2s1
Electrons configuration rule that states electrons do not pair until they have to. (put one
electrons in each electron domain then pair up) - answerHund's rule
, An experimental phenomena associated with atoms having unpaired electrons - which
states such substances are attracted to magnetic fields - answerParamagnetism
Which drop in energy level results in the greatest emission of energy? - answern=2 to
n=1
quantum numbers - answer
What do the 4 quantum numbers stand for? - answern = 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 - answers 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 - answerChromium
What two subatomic particles have the most mass, but occupy very little of the volume
of an atom - answerprotons and neutrons
Define Isoelectronic - answerHaving the same amount of electrons
How does a sodium ion differ from a sodium atom? - answerthe 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 - answerisomer
two or more different physical forms in which an element can exist. Graphite, charcoal,
and diamond are all ________ of carbon. - answerallotropes
What makes up an alpha particle? - answer2 protons and 2 neutrons
What did Millikan discover from his oil drop experiments? - answerthe magnitude of the
charge on an electron
Periods vs Groups - answer
when an atom of an electropositive atom becomes an ion it..? - answerbecomes larger
