Atomic Mass Number Worksheet
A Grade 9 science worksheet focusing on understanding and calculating atomic mass number, including protons, neutrons, and electrons.
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Atomic Mass Number Worksheet
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Date:
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Read each question carefully and provide your answer in the space provided. Show all calculations where necessary.
1. What does the atomic mass number represent?
The number of protons in an atom
The number of electrons in an atom
The total number of protons and neutrons in an atom
The total number of subatomic particles in an atom
2. An atom has 6 protons, 6 neutrons, and 6 electrons. What is its atomic mass number?
6
12
18
3
1. The atomic number of an element is equal to the number of in its nucleus.
2. Isotopes of an element have the same number of protons but different numbers of .
3. The atomic mass unit (amu) is approximately equal to the mass of a proton or a .
1. Explain the difference between atomic number and atomic mass number.
2. An atom of phosphorus (P) has an atomic number of 15 and an atomic mass number of 31. How many neutrons does this atom have?
1. All atoms of a given element have the same atomic mass number.
True
False
2. Electrons contribute significantly to the atomic mass number.
True
False
Observe the diagram of an atomic structure below and answer the questions.
1. Based on the diagram, if the red spheres represent protons and the blue spheres represent neutrons, what is the atomic mass number of this atom?
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