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Worksheets2023 Unit 3 CP4 Review Game Atoms and Atomic structure
Total questions: 54
Worksheet time: 27mins
Which of the following statements is true?
A) Atoms of the same element may have different masses.
B) Atoms may be divided in ordinary chemical reactions.
C) Atoms can never combine with any other atoms.
D) Matter is composed of large particles called atoms.
In the Bohr model of the atom, an electron in an orbit has a fixed ____.
position
energy
color
size
How does the energy of an electron change when the electron moves closer to the nucleus?
It decreases.
It increases.
It stays the same.
It doubles.
What element is this?
He
H
Ar
Ag
How are the frequency and wavelength of light related?
They are inversely proportional to each other.
Frequency equals wavelength divided by the speed of light.
Wavelength is determined by dividing frequency by the speed of light.
They are directly proportional to each other.
Emission of light from an atom occurs when an electron ____.
drops from a higher to a lower energy level
jumps from a lower to a higher energy level
moves within its atomic orbital
falls into the nucleus
A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a(n)
nuclide.
neutron.
electron.
isotope.
Helium-4 and helium-3 are
isotopes.
different elements.
nuclei.
compounds.
The atomic number of oxygen, 8, indicates that there are eight
protons in the nucleus of an oxygen atom.
oxygen nuclides.
neutrons outside the oxygen atom's nucleus.
energy levels in the oxygen atom's nucleus.
What element is represented in this Bohr Model?
C
Li
H
Al
The nucleus of an atom has all of the following characteristics EXCEPT that it
is positively charged.
is very dense.
contains nearly all of the atom's mass.
contains nearly all of the atom's volume.
The mass of a neutron is
about the same as that of a proton.
about the same as that of an electron.
double that of a proton.
double that of an electron.
An atom is electrically neutral because
neutrons balance the protons and electrons.
nuclear forces stabilize the charges.
the numbers of protons and electrons are equal.
the numbers of protons and neutrons are equal.
How would you draw a Lewis dot diagram for Magnesium?
The total number of protons and neutrons in the nucleus of an atom is its
atomic number.
Avogadro constant.
mass number.
number of neutrons.
All atoms of the same element have the same
atomic mass.
number of neutrons.
mass number.
atomic number.
The region outside the nucleus where an electron can most probably be found is the
electron configuration.
quantum.
s sublevel.
electron cloud.
How many valence electrons in the atom below?
2
3
4
5
Atoms of the same element can differ in
chemical properties.
mass number.
atomic number.
number of protons and electrons.
The abbreviation for atomic mass unit is
amu
mu
a
g
The carbon-12 atom is assigned a relative mass of exactly
1 amu
6 amu
12 amu
100 amu
The average atomic mass of an element depends on both the masses of its isotopes and each isotope's
atomic number.
radioactivity.
relative abundance.
mass number.
What is the mass number of this atom?
1
3
4
7
What is the atomic number for aluminum from your periodic table?
13
14
27
26.98154
On your periodic table, a neutral atom of silicon contains
14 electrons.
28.09 electrons.
16 electrons.
38 electrons.
Zn-66 (atomic number 30) has
30 neutrons
33 neutrons
36 neutrons
96 neutrons
Which color of visible light has the shortest wavelength?
yellow
green
blue
violet
Which of the following electromagnetic waves have the highest frequencies?
ultraviolet light waves
X-rays
microwaves
gamma rays
An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is
13
14
27
40
Which type of electromagnetic radiation includes the wavelength 10-7 m?
visible light
radio wave
microwaves
gamma rays
According to Bohr, electrons cannot reside at ____ in the figure above.
A
B
C
D
The part of the atom where the electrons CANNOT be found is the
area surrounding the nucleus.
nucleus
electron cloud.
orbitals.
The distance between two successive peaks on a wave is its
frequency.
wavelength.
quantum number.
velocity.
In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly?
In, 49 protons, 49 electrons
Zn, 30 protons, 60 electrons
Cs, 55 protons, 132.9 electrons
F, 19 protons, 19 electrons
Using the periodic table, determine the number of neutrons in O.
8
4
16
24
Select the correct symbol for an atom of tritium.
A
B
C
D
Which of the following sets of symbols represents isotopes of the same element?
A
B
C
D
The element chromium has four naturally occurring isotopes. Use the relative abundance of each to calculate the average atomic mass of chromium.
Cr-50 = 4.34%,
Cr-52 = 83.79%,
Cr-53= 9.50%,
Cr-54 = 2.37%.
52
52.05
52.06
51.99
In which of the following is the number of neutrons correctly represented?
A
B
C
D
Oxygen is a gas important for life and it represents about 21% of the Earth’s atmosphere. Which of the illustrations below best represents a Bohr diagram of an oxygen atom?
Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37. The atomic mass of chlorine is 35.45. Which of these two isotopes of chlorine is more abundant?
they are equally abundant
Cl-35
Cl-17
Cl-37
The following diagram is a Bohr diagram of which element from the periodic table?
H
N
Li
Na
In the atomic model of potassium below, which letter represents a valence electron?
A
B
C
D
Which one of the following Lewis structures is NOT a CORRECT representation?
A
B
C
D
Chlorine has atomic number 17 and mass number 35. It has
17 protons, 17 electrons, and 18 neutrons
35 protons, 35 electrons, and 17 neutrons.
17 protons, 17 electrons, and 52 neutrons.
18 protons, 18 electrons, and 17 neutrons.
What is the atomic number of this atom?
2
4
6
none of the above
What is the number of electrons in the outermost energy level of an oxygen atom?
2
4
6
8
What is the total number of electrons needed to fill the first two energy levels?
2
6
10
18
The energy level that can hold only two electrons is the
first.
second.
third.
fourth.
What does the number 84 in the name krypton-84 represent?
the atomic number
the mass number
the sum of the protons and electrons
twice the number of protons
Carbon-14 (atomic number 6), the radioactive nuclide used in dating fossils, has
6 neutrons
8 neutrons.
10 neutrons.
14 neutrons.
Neon-22 contains 12 neutrons. It also contains
12 protons.
22 protons.
22 electrons.
10 protons.
The number of atoms in 1 mol of carbon is
6.02 x1022
6.02 x1023
5.02 x1022
5.02 x1023
