Building Atoms Worksheet
Explore the fundamental components and structure of atoms with this Grade 9 science worksheet, covering protons, neutrons, and electrons.
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Building Atoms: The Basics
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Read each question carefully and provide your best answer. Use the provided diagram to help you answer the questions about atomic structure.
Observe the Bohr model of an atom below:
1. The three main subatomic particles that make up an atom are , , and .
2. The are located in the nucleus of an atom and have a positive charge.
3. have no electrical charge and are also found in the nucleus.
4. Negatively charged particles called orbit the nucleus in energy shells.
1. All atoms of the same element have the same number of neutrons.
True
False
2. The atomic number of an element is determined by the number of its electrons.
True
False
1. Which subatomic particle contributes significantly to the mass of an atom but has no charge?
Electron
Proton
Neutron
Nucleus
2. An atom is electrically neutral when it has an equal number of which two subatomic particles?
Protons and Neutrons
Protons and Electrons
Neutrons and Electrons
All three are always equal
1. Explain the primary difference between an ion and an isotope.
2. How does the number of valence electrons influence an atom's chemical reactivity?