Atomic Mass Number Worksheet
Explore the concepts of atomic number, mass number, protons, neutrons, and electrons in atoms for Grade 7 Science.
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Atomic Mass Number Worksheet
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Read each question carefully and answer to the best of your ability. Refer to the provided diagram of an atom as needed.
Below is a simplified diagram of an atom:
1. The center of an atom is called the .
2. Particles with a positive charge in an atom are called .
3. Particles with no charge in an atom are called .
4. Particles with a negative charge orbiting the nucleus are called .
5. The atomic number of an element is equal to the number of in its nucleus.
1. What does the atomic mass number represent?
The number of electrons
The sum of protons and neutrons
The number of protons only
The size of the atom
2. An atom has 6 protons, 6 neutrons, and 6 electrons. What is its atomic mass number?
6
12
18
0
1. An element has an atomic number of 8 and a mass number of 16. How many neutrons does this element have? Show your work.
2. Explain why the atomic number uniquely identifies an element, but the mass number does not.
1. All atoms of the same element must have the same number of neutrons.
True
False
2. The mass of an electron is much greater than the mass of a proton.
True
False
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