Multiple Choice
Potassium (K) has atomic number 19. How many occupied electron shells (principal energy levels) does a neutral potassium atom have in its ground state?
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9. Electrons in Atoms and the Periodic Table
Electronic Structure: Shells
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which electron possesses the lowest possible energy from the image provided?
A
A
B
B
C
C
D
D
E
E
Verified step by step guidance1
Identify the concept of electron energy levels: Electrons are arranged in energy levels or shells around the nucleus of an atom. The closer an electron is to the nucleus, the lower its energy.
Observe the image: The image shows a nucleus at the center with several concentric circles representing different energy levels. Electrons are placed on these circles labeled A, B, C, D, and E.
Determine the position of each electron: Electron D is closest to the nucleus, followed by C, B, E, and A, which is the farthest.
Apply the concept of energy levels: Electrons closer to the nucleus (inner shells) have lower energy compared to those farther away (outer shells).
Conclude which electron has the lowest energy: Since electron D is closest to the nucleus, it possesses the lowest possible energy among the given options.
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