Atomic Structure Review
A Grade 12 science worksheet reviewing the fundamental concepts of atomic structure, including subatomic particles, isotopes, and electron configuration.
Includes
Standards
Topics
Atomic Structure Review
Name:
Date:
Score:
Read each question carefully and answer to the best of your knowledge. Show all work for calculations.
1. Which subatomic particle has a negative charge and is found in orbitals around the nucleus?
Proton
Neutron
Electron
Photon
2. An isotope of an element has a different number of:
Protons
Electrons
Neutrons
Atomic number
3. The atomic number of an element is determined by the number of in the nucleus.
4. The mass number of an atom is the sum of its and .
5. According to Bohr's model, electrons occupy specific energy levels or .
6. All atoms of the same element have the same number of protons.
True
False
7. The electron cloud model describes electrons moving in fixed orbits around the nucleus.
True
False
8. Explain the main difference between an atom and an ion.
9. Describe the contributions of Ernest Rutherford to the understanding of atomic structure.
Match the term on the left with its definition on the right.
10. Atomic Mass Unit (amu)
a. The average mass of an element's isotopes
11. Atomic Orbital
b. A region around the nucleus where an electron is likely to be found
12. Valence Electrons
c. Electrons in the outermost shell of an atom
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