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WorksheetsAtomic Structure Quiz
Total questions: 91
Worksheet time: 15mins
What is Dalton's Atomic Theory primarily about?
Electrons and protons in atoms
The nature of chemical reactions
The existence and nature of matter
The concept of radioactivity
According to Dalton's Atomic Theory, atoms of a particular element are:
Different in size
Identical in mass and volume
Only present in liquids
Indivisible in nature
What is the main conclusion from Rutherford's experiment?
The atom is indivisible
Atoms are mostly empty space
Electrons are inside the nucleus
Electrons orbit in fixed paths
What was Rutherford's model of the atom similar to?
A jelly model
A planetary system
A billiard ball
A vortex
Which of the following is a limitation of Rutherford's atomic model?
It explains energy emission
It predicts the atom's stability
It cannot explain the continuous emission spectrum
It accurately describes electron paths
Bohr's Atomic Model introduced the idea of:
Random electron movement
Electrons in orbits with fixed energy
Electrons moving through empty space
Electrons emitting continuous radiation
Bohr's model works well for:
Hydrogen atoms
All atoms
Atoms with more than one electron
Neutron-rich atoms
What principle did Heisenberg's Uncertainty Principle describe?
Electrons move in fixed orbits
Electrons can be in many places at once
We cannot simultaneously know the exact position and momentum of an electron
Electrons are always stationary
What did Louis de Broglie propose about electrons?
They have wave-like properties
They are always stationary
They are particles only
They behave like light
What are orbitals in the quantum mechanical model?
Fixed paths for electrons
Probability regions for finding electrons
Orbits in the shape of spheres
Regions with no electrons
The nucleus of an atom contains:
Electrons
Protons and neutrons
Only neutrons
Only protons
Which of the following is true about protons?
They have no charge
They are negatively charged
They have a positive charge
They are much lighter than neutrons
The number of protons in an atom is called its:
Atomic mass
Mass number
Proton number or atomic number
Nucleon number
The total number of protons and neutrons in an atom is called its:
Atomic number
Mass number
Isotopic number
Neutron number
Which particle has the smallest mass?
Proton
Neutron
Electron
None
The relative mass of an electron is approximately:
1 amu
1/1836 amu
0 amu
1836 amu
Which of the following elements has an atomic number of 1?
Oxygen
Carbon
Hydrogen
Helium
Isotopes of an element have:
Different atomic numbers
The same number of neutrons
The same number of protons
Different numbers of protons
Which isotope of Hydrogen has one neutron?
Protium
Deuterium
Tritium
None
Which of the following elements has isotopes with mass numbers 12, 13, and 14?
Hydrogen
Oxygen
Carbon
Chlorine
Which is true about the isotope Carbon-14?
It has 7 neutrons
It is stable
It decays over time
It is used in medical treatments
What is the symbol for the isotope of chlorine with mass number 35?
37¦17 Cl
35¦17 Cl
36¦17 Cl
34¦17 Cl
Which of the following is a use of isotopes?
Determining atomic number
Carbon dating
Changing the chemical properties of elements
Increasing the mass of elements
Which of the following is a radioactive isotope?
Carbon-12
Oxygen-16
Uranium-238
Nitrogen-14
Which particle is unaffected by electric fields?
Electron
Proton
Neutron
Photon
Which of the following particles bends towards the positive plate in an electric field?
Neutron
Proton
Electron
All of the above
The relative atomic mass of hydrogen is:
1.008 amu
2.000 amu
12.000 amu
0.000 amu
The mass of one carbon-12 atom is assigned as:
1 amu
12 amu
6 amu
18 amu
What is the symbol for the isotope of Uranium with mass number 235?
238¦92 U
234¦92 U
235¦92 U
237¦92 U
Which of the following isotopes is used in nuclear reactors?
Uranium-234
Uranium-235
Uranium-238
Carbon-14
What is the concept of 'atomic mass unit' (amu)?
It is the mass of an electron
It is one-twelfth of the mass of a C-12 atom
It is the mass of a proton
It is the mass of a neutron
The relative atomic mass of an element is based on:
The mass of a single atom of the element
The average mass of the naturally occurring isotopes
The number of neutrons
The total number of protons
The relative atomic mass of an element is always measured against:
Hydrogen
Oxygen
Carbon-12
Nitrogen
An element with two isotopes A and B has a relative atomic mass of 35.5 amu. What is the isotopic mass of isotope B if isotope A has a mass of 35 amu?
36 amu
37 amu
34 amu
33 amu
What is the percentage abundance of Carbon-12 in naturally occurring carbon?
100%
98.8%
99.9%
75.77%
Which isotope of Uranium is used in atomic bombs?
Uranium-234
Uranium-235
Uranium-238
Uranium-236
What happens during radioactive decay?
The atom becomes chemically inert
The atom gains protons
The nucleus of the atom changes
The number of neutrons remains constant
Radioactive isotopes can be used in:
Radiotherapy
Carbon dating
Tracing chemical reactions
All of the above
The energy emitted when an electron falls to a lower energy orbit is:
Absorbed
Emitted
Converted to mass
Not detectable
Which atomic model introduced the idea of quantized orbits for electrons?
Dalton's model
Rutherford's model
Bohr's model
Quantum mechanical model
The principal shortcoming of Bohr's atomic model is that it:
Could only explain hydrogen atom behavior
Failed to explain the hydrogen spectrum
Did not describe the nucleus correctly
Proposed electrons in fixed orbits
Who proposed that electrons exhibit both particle and wave properties?
Niels Bohr
Louis de Broglie
Werner Heisenberg
John Dalton
Which particle is used in Rutherford's experiment to probe atomic structure?
Protons
Neutrons
Alpha particles
Electrons
Which experiment led to the discovery of the electron?
Rutherford's gold foil experiment
Thomson's cathode ray tube experiment
Bohr's atomic experiment
Millikan's oil drop experiment
What was the major discovery of the Rutherford experiment?
Electrons are located in fixed orbits
The nucleus is very small but dense
Electrons revolve around the nucleus
Atoms are indivisible
What is the total number of electrons in a neutral atom of carbon-12?
6
12
14
8
Who discovered that electrons orbit the nucleus in specific energy levels?
Rutherford
Thomson
Bohr
Heisenberg
Which atomic model describes the electron as a probability wave?
Bohr model
Rutherford model
Quantum mechanical model
Dalton model
Which atomic model describes the electron as a probability wave?
Bohr model
Rutherford model
Quantum mechanical model
Dalton model
Which particle has a positive charge?
Neutron
Electron
Proton
Photon
Which concept did Louis de Broglie introduce?
Electrons have wave-like properties
Electrons travel in fixed orbits
Electrons are waves only
Electrons emit energy in quantized steps
Who is credited with the discovery of the neutron?
Ernest Rutherford
Niels Bohr
James Chadwick
J.J. Thomson
What does the term "isotopes" refer to?
Atoms of different elements
Atoms of the same element with different numbers of protons
Atoms of the same element with different numbers of neutrons
Atoms with identical chemical behavior
What does the quantum mechanical model describe?
Electrons orbit the nucleus in fixed paths
Electrons are in probabilistic locations
Electrons move in a spiral pattern
Electrons are always in motion
Which of the following is true about atomic mass?
It equals the atomic number
It is the average mass of all the isotopes of an element
It is always an integer
It is calculated only for neutral atoms
What is the main purpose of the atomic model in chemistry?
To predict chemical reactions
To explain the formation of compounds
To describe the arrangement of atoms in matter
To calculate atomic masses
Which model proposed that electrons exist in regions of space called orbitals?
Bohr's model
Rutherford's model
Quantum mechanical model
Dalton's model
Which statement best describes the electron's behavior in the quantum mechanical model?
Electrons orbit in fixed paths
Electrons are located in distinct shells
Electrons are found in probability regions
Electrons are stationary
Which experiment confirmed the existence of the atomic nucleus?
Thomson's cathode ray experiment
Rutherford's gold foil experiment
Millikan's oil drop experiment
Bohr's atomic theory
What does the term 'quantum' refer to in atomic theory?
The fixed size of an electron
The smallest unit of energy
The charge of a proton
The mass of an atom
Which subatomic particle determines the chemical behavior of an atom?
Proton
Neutron
Electron
Photon
What is a cation?
A negatively charged ion
A positively charged ion
An atom with equal protons and electrons
An atom with an unequal number of neutrons and protons
How is a cation formed?
When an atom gains electrons
When an atom loses electrons
When an atom gains neutrons
When an atom loses neutrons
Which element forms a cation with the configuration of a noble gas by losing one electron?
Oxygen
Sodium
Magnesium
Chlorine
What is the charge on a magnesium ion after it loses two electrons?
+1
+2
-1
-2
Which of the following is a characteristic of anions?
They are positively charged
They are negatively charged
They are formed by losing electrons
They are found only in metals
Which element gains two electrons to form an anion with a noble gas configuration?
Oxygen
Fluorine
Chlorine
Sulphur
How is the formation of an anion different from the formation of a cation?
Anions are formed by gaining protons, cations by losing electrons
Anions are formed by gaining electrons, cations by losing electrons
Anions are formed from metals, cations from non-metals
There is no difference between anions and cations
Which non-metal atom needs one electron to complete its octet and form an anion?
Oxygen
Fluorine
Chlorine
Sulphur
What is the main difference between shells and sub-shells?
Sub-shells are regions where electrons are most likely found, while shells are fixed orbits
Shells and sub-shells are the same thing
Shells are part of sub-shells
Sub-shells are larger than shells
In Bohr's atomic theory, shells are also called:
Electron clouds
Energy levels
Orbitals
Sub-shells
Which of the following is true about the 3p sub-shell?
It can hold a maximum of 2 electrons
It can hold a maximum of 6 electrons
It can hold a maximum of 10 electrons
It can hold a maximum of 14 electrons
How many sub-shells are there in the M shell?
1
2
3
4
The 4f sub-shell can accommodate a maximum of how many electrons?
2
6
10
14
According to the Aufbau principle, electrons fill which of the following first?
Highest energy sub-shell
Lowest energy sub-shell
Sub-shells with the most electrons
Orbitals farthest from the nucleus
Which of the following is the correct order of energy for sub-shells?
1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p
1s < 2s < 3p < 3s < 2p
2s < 1s < 3p < 4s
3s < 2s < 1s < 4p
Which sub-shell can accommodate a maximum of 10 electrons?
s
p
d
f
What is the correct electronic configuration for sodium (Na)?
1s2 2s2 2p6 3s1
1s2 2s2 3p1
1s2 2s2 2p6 3s2
1s2 2s2 2p6 3p2
Which of the following represents the correct electron configuration for magnesium (Mg)?
1s2 2s2 2p6 3s1
1s2 2s2 2p6 3s2
1s2 2s2 3s2
1s2 2s2 3p1
Which statement is true about isotopes?
They have the same number of protons
They have the same number of neutrons
They have different atomic numbers
They have different electron configurations
Which isotope is commonly used to irradiate cancer cells?
Iodine - 123
Carbon - 14
Cobalt - 60
Iodine - 131
Which sub-shell can hold a maximum of 14 electrons?
s
p
d
f
The shell represented by the quantum number n=3 is called the:
K shell
L shell
M shell
N shell
What does the notation for an atom of an element consist of?
Mass number, atomic number, and chemical symbol
Atomic number and charge only
Atomic number and mass number only
Chemical symbol and the number of protons only
Which of the following is a correct electronic configuration for silicon (Si)?
1s2 2s2 2p6 3s2 3p2
1s2 2s2 2p6 3s1 3p1
1s2 2s2 2p6 3s2 3p3
1s2 2s2 2p6 3p4
What is the charge on the ion formed by aluminum (Al)?
+1
+2
+3
-1
How many electrons does potassium (atomic number 19) have?
19
18
20
39
Which of the following elements has an electron configuration of 1s2 2s2 2p6 3s2 3p5?
Chlorine
Fluorine
Argon
Phosphorus
What is the correct electronic configuration for the element with atomic number 14?
1s2 2s2 2p6 3s2
1s2 2s2 2p6 3s1
1s2 2s2 2p6 3s2 3p2
1s2 2s2 3p1
What is the atomic number of magnesium (Mg)?
12
24
20
18
What does the atomic symbol 13Al3+ represent?
An atom of aluminum with 13 protons and 14 neutrons
An ion of aluminum with 13 protons and 10 electrons
An atom of aluminum with 27 protons and 13 neutrons
An atom of aluminum with 14 protons and 13 electrons
