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ACS CHEMISTRY GENERAL EXAM
COMPLETELY UPDATED 2025–2026 EDITION |
VERIFIED QUESTIONS & 100% ACCURATE
ANSWERS | GUARANTEED A+ PERFORMANCE
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
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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:
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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:
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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:
ACS CHEMISTRY GENERAL EXAM
COMPLETELY UPDATED 2025–2026 EDITION |
VERIFIED QUESTIONS & 100% ACCURATE
ANSWERS | GUARANTEED A+ PERFORMANCE
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
,2|Page
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:
,3|Page
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:
, 4|Page
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:
