ACS CHEMISTRY ACTUAL
EXAM. GRADED A+. WITH
QUESTIONS AND 100%
VERIFIED ANSWERS. LATEST
2025/2026 UPDATE
Layout of an element (mass # & atomic #) - Ans✔✔-
atomic number = - Ans✔✔-# of protons
mass number = - Ans✔✔-# of protons + neutrons
the number of protons in a neutral atom will equal the - Ans✔✔-# of electrons
how to find the correct number of neutrons - Ans✔✔-mass number - atomic
number
Forms of the same elements that differ in amount of neutrons - Ans✔✔-
isotopes
,What particle, if lost from the nucleus, would NOT cause a change in the
atomic number? - Ans✔✔-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? - Ans✔✔-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? - Ans✔✔-IA
alkali metals
electromagnetic spectrum - Ans✔✔-
The greater the wavelength of a photon..? - Ans✔✔-the lower its frequency
The greater the frequency of a photon...? - Ans✔✔-the shorter its wavelength
Light energy formula - Ans✔✔-
What does C in the light energy formula represent? - Ans✔✔-
Give the ground-state electron configuration of an atom in the second period -
Ans✔✔-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) - Ans✔✔-Hund's rule
An experimental phenomena associated with atoms having unpaired electrons
- which states such substances are attracted to magnetic fields - Ans✔✔-
Paramagnetism
Which drop in energy level results in the greatest emission of energy? -
Ans✔✔-n=2 to n=1
quantum numbers - Ans✔✔-
What do the 4 quantum numbers stand for? - Ans✔✔-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 - Ans✔✔-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 - Ans✔✔-
Which element is represented by X - Ans✔✔-Chromium
EXAM. GRADED A+. WITH
QUESTIONS AND 100%
VERIFIED ANSWERS. LATEST
2025/2026 UPDATE
Layout of an element (mass # & atomic #) - Ans✔✔-
atomic number = - Ans✔✔-# of protons
mass number = - Ans✔✔-# of protons + neutrons
the number of protons in a neutral atom will equal the - Ans✔✔-# of electrons
how to find the correct number of neutrons - Ans✔✔-mass number - atomic
number
Forms of the same elements that differ in amount of neutrons - Ans✔✔-
isotopes
,What particle, if lost from the nucleus, would NOT cause a change in the
atomic number? - Ans✔✔-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? - Ans✔✔-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? - Ans✔✔-IA
alkali metals
electromagnetic spectrum - Ans✔✔-
The greater the wavelength of a photon..? - Ans✔✔-the lower its frequency
The greater the frequency of a photon...? - Ans✔✔-the shorter its wavelength
Light energy formula - Ans✔✔-
What does C in the light energy formula represent? - Ans✔✔-
Give the ground-state electron configuration of an atom in the second period -
Ans✔✔-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) - Ans✔✔-Hund's rule
An experimental phenomena associated with atoms having unpaired electrons
- which states such substances are attracted to magnetic fields - Ans✔✔-
Paramagnetism
Which drop in energy level results in the greatest emission of energy? -
Ans✔✔-n=2 to n=1
quantum numbers - Ans✔✔-
What do the 4 quantum numbers stand for? - Ans✔✔-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 - Ans✔✔-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 - Ans✔✔-
Which element is represented by X - Ans✔✔-Chromium
