Atom Structure Worksheet
A Grade 9 science worksheet covering the fundamental structure of atoms, including subatomic particles, atomic number, mass number, and isotopes.
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Standards
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Atom Structure Worksheet
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Read each question carefully and answer to the best of your ability. Show all your work for calculations.
1. Which subatomic particle has a positive charge?
Electron
Neutron
Proton
Nucleus
2. The atomic number of an element is determined by the number of:
Neutrons
Electrons
Protons
Protons and Neutrons
3. The is the central part of an atom, containing protons and neutrons.
4. Atoms of the same element that have different numbers of neutrons are called .
5. The mass number of an atom is the sum of its and .
6. All atoms of a given element have the same number of electrons.
True
False
7. Electrons are found in the nucleus of an atom.
True
False
8. Describe the main difference between a proton and an electron in terms of charge and location within an atom.
9. An atom has 17 protons, 18 neutrons, and 17 electrons. What is its atomic number and mass number? Identify the element.
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