Grade 9 Science: Atomic Energy Levels
This worksheet covers fundamental concepts of atomic energy levels, electron shells, and electron configurations for Grade 9 Science students.
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Atomic Energy Levels Worksheet
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Date:
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Read each question carefully and answer to the best of your ability. Show all your work where applicable.
1. What are the paths or orbits of electrons around the nucleus of an atom called?
Nucleons
Electron shells
Proton rings
Neutron clouds
2. How many electrons can the first energy level (K shell) hold?
1
2
8
18
3. Electrons in the outermost shell are called electrons.
4. The maximum number of electrons in the third energy level (M shell) is .
5. When an electron moves to a higher energy level, it energy.
6. Explain the concept of a 'ground state' and an 'excited state' for an electron in an atom.
7. Observe the diagram of an atom below. Label the nucleus and the first two electron shells.
8. All electrons in an atom occupy the same energy level.
True
False
9. The number of valence electrons determines an element's chemical reactivity.
True
False
10. An atom has 7 protons and 7 neutrons. What is its electron configuration, assuming it is a neutral atom?