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WorksheetsQuiz on Structure of the Atom
Total questions: 15
Worksheet time: 8mins
What are atoms made up of?
Compounds
Cells
Tiny particles
Molecules
Who discovered the electron?
Niels Bohr
James Chadwick
J.J. Thomson
E. Goldstein
What is the charge of a proton?
+1.6 × 10⁻¹⁹ C
0
+1.0 × 10⁻¹⁹ C
-1.6 × 10⁻¹⁹ C
What is the mass of a neutron approximately equal to?
1/1837 of a proton
1 u
0.5 u
2 u
What is the main limitation of Thomson's model of the atom?
It did not include neutrons.
It was based on incorrect experiments.
It was too complex.
It could not explain the stability of the atom.
What did Rutherford's Gold Foil Experiment conclude?
Atoms are indivisible.
Atoms are made of only protons.
Atoms have a small, dense nucleus.
Electrons are embedded in a positive sphere.
In Bohr's model, what are the fixed paths called where electrons revolve?
Orbits
Paths
Shells
Levels
What does the atomic number (Z) represent?
Number of electrons in a charged atom
Total mass of the atom
Number of protons
Number of neutrons
Which of the following is an example of isotopes?
¹⁸Ar₄₀ and ²⁰Ca₄₀
¹⁴C₆ and ¹⁵N₇
Protium (¹H) and Deuterium (²H)
¹⁶O₈ and ¹⁷O₈
What is valency?
The number of protons
The number of neutrons
The mass of an atom
The combining capacity of an element
What is the maximum number of electrons in the L shell?
18
8
2
32
Which isotope is used as nuclear fuel?
H-2
U-235
I-131
Co-60
Who discovered the neutron?
J.J. Thomson
E. Goldstein
Niels Bohr
James Chadwick
What is the mass number (A) of an atom?
Number of protons only
Number of neutrons only
Sum of protons and neutrons
Number of electrons only
What is the charge of an electron?
+1.0 × 10⁻¹⁹ C
+1.6 × 10⁻¹⁹ C
-1.6 × 10⁻¹⁹ C
0
