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CHEM 219 Portage Learning - Module 1 Overview
(Updated 2025) Complete Questions & Answers
(Solved) 100% Guaranteed Pass.
The atomic radii of zirconium (Zr) and hafnium (Hf) are nearly the same despite the fact that
hafnium has 32 more protons and electrons. Which of the following bests explains this
phenomenon? - CORRECT ANS ✓✓ Hafnium contains electrons in the 4f orbitals. These 4f
electrons do not effectively shield the higher nuclear charge and thus Zeff is higher than
might be otherwise expected.
Which of the following is true concerning successive ionizations of an atom and its ions? -
CORRECT ANS ✓✓ Each successive ionization requires increasing amounts of energy
The energy of a photon equals its Planck's constant (h) multiplied by the speed of light(c) and
then divided by the wavelength. E = hc/λ. If microwaves are changed to x-rays, what effect
does this have on the energy of the photon - CORRECT ANS ✓✓ The energy of the photon
increases
Photons are shone on a piece of metal and one electron is ejected for each absorbed photon.
What happens when the wavelength of light is decreased? - CORRECT ANS ✓✓ The ejected
electrons would have greater kinetic energy
What type of light on the electromagnetic spectrum has the highest energy per photon?
X-ray
visible light
microwaves
Gamma waves - CORRECT ANS ✓✓ Gamma waves
Energy of a photon is ______ proportional to frequency, and _______ proportional to
wavelength - CORRECT ANS ✓✓ directly, inversely
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What is observed when a noble gas is heated and the emitted light shone through a prism? -
CORRECT ANS ✓✓ individual lines of varying colors
Heating a noble gas promotes its electrons to excited energy states, which then relax to emit
discrete wavelengths of light. When shone through a prism, this results in individual lines of
varying colors.
Bohr Model - CORRECT ANS ✓✓ model of the atom in which electrons move rapidly
around the nucleus in paths called orbits
Electromagnetic Energy - CORRECT ANS ✓✓ a form of energy that travels through space in
the form of waves
Quantum Theory - CORRECT ANS ✓✓ describes mathematically the wave properties of
electrons and other very small particles
Periodic Properties - CORRECT ANS ✓✓ properties whose values can be predicted based on
the element's position on the periodic table
Which periodic trend quantifies the amount of energy required to remove an electron from a
neutral, gaseous atom? - CORRECT ANS ✓✓ Ionization energy is the amount of energy
required to remove an electron from a neutral, gaseous atom
atomic radius trend - CORRECT ANS ✓✓ The atomic radius increases as you move down
the periodic table and to the left. Tantalum is the furthest to the right of this list and nearer the
top and it would be expected to have the smallest atomic radius
ionization energies - CORRECT ANS ✓✓ amount of energy a gaseous atom or ion must
absorb to lose its outermost electron.
In general, first ionization energy decreases down a group and increases across a period
The first five ionization energies of an element are as follows (in kJ/mol): 577.9, 1820, 2750,
11600, 14800. Which of the following elements is most likely to have these ionization energy
values? - CORRECT ANS ✓✓ D) Al
CHEM 219 Portage Learning - Module 1 Overview
(Updated 2025) Complete Questions & Answers
(Solved) 100% Guaranteed Pass.
The atomic radii of zirconium (Zr) and hafnium (Hf) are nearly the same despite the fact that
hafnium has 32 more protons and electrons. Which of the following bests explains this
phenomenon? - CORRECT ANS ✓✓ Hafnium contains electrons in the 4f orbitals. These 4f
electrons do not effectively shield the higher nuclear charge and thus Zeff is higher than
might be otherwise expected.
Which of the following is true concerning successive ionizations of an atom and its ions? -
CORRECT ANS ✓✓ Each successive ionization requires increasing amounts of energy
The energy of a photon equals its Planck's constant (h) multiplied by the speed of light(c) and
then divided by the wavelength. E = hc/λ. If microwaves are changed to x-rays, what effect
does this have on the energy of the photon - CORRECT ANS ✓✓ The energy of the photon
increases
Photons are shone on a piece of metal and one electron is ejected for each absorbed photon.
What happens when the wavelength of light is decreased? - CORRECT ANS ✓✓ The ejected
electrons would have greater kinetic energy
What type of light on the electromagnetic spectrum has the highest energy per photon?
X-ray
visible light
microwaves
Gamma waves - CORRECT ANS ✓✓ Gamma waves
Energy of a photon is ______ proportional to frequency, and _______ proportional to
wavelength - CORRECT ANS ✓✓ directly, inversely
, Page |2
What is observed when a noble gas is heated and the emitted light shone through a prism? -
CORRECT ANS ✓✓ individual lines of varying colors
Heating a noble gas promotes its electrons to excited energy states, which then relax to emit
discrete wavelengths of light. When shone through a prism, this results in individual lines of
varying colors.
Bohr Model - CORRECT ANS ✓✓ model of the atom in which electrons move rapidly
around the nucleus in paths called orbits
Electromagnetic Energy - CORRECT ANS ✓✓ a form of energy that travels through space in
the form of waves
Quantum Theory - CORRECT ANS ✓✓ describes mathematically the wave properties of
electrons and other very small particles
Periodic Properties - CORRECT ANS ✓✓ properties whose values can be predicted based on
the element's position on the periodic table
Which periodic trend quantifies the amount of energy required to remove an electron from a
neutral, gaseous atom? - CORRECT ANS ✓✓ Ionization energy is the amount of energy
required to remove an electron from a neutral, gaseous atom
atomic radius trend - CORRECT ANS ✓✓ The atomic radius increases as you move down
the periodic table and to the left. Tantalum is the furthest to the right of this list and nearer the
top and it would be expected to have the smallest atomic radius
ionization energies - CORRECT ANS ✓✓ amount of energy a gaseous atom or ion must
absorb to lose its outermost electron.
In general, first ionization energy decreases down a group and increases across a period
The first five ionization energies of an element are as follows (in kJ/mol): 577.9, 1820, 2750,
11600, 14800. Which of the following elements is most likely to have these ionization energy
values? - CORRECT ANS ✓✓ D) Al
