Building Atoms: Grade 7 Science
Explore the fundamental particles of an atom and how they combine to form different elements.
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Building Atoms
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Read each question carefully and answer to the best of your ability. Refer to your knowledge of atomic structure.
1. Which subatomic particle has a positive charge?
Electron
Neutron
Proton
Photon
2. The atomic number of an element is determined by the number of:
Electrons
Neutrons
Protons
Protons and Neutrons
3. The center of an atom is called the .
4. Atoms of the same element with different numbers of neutrons are called .
5. The mass number of an atom is the sum of its and .
6. Describe the role of electrons in an atom.
7. All atoms of a given element have the same number of protons.
True
False
8. Neutrons carry a negative charge.
True
False
9. Label the parts of the atom shown in the diagram.
A:
B:
C: