Multiple Choice
Why is the current atomic model referred to as the 'electron cloud model'?
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10. Periodic Properties of the Elements
The Electron Configuration
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How many electron-containing orbitals are present in a neutral atom of arsenic (atomic number 33)?
A
18
B
33
C
17
D
16
Verified step by step guidance1
Identify the electron configuration of arsenic (atomic number 33) by filling orbitals in order of increasing energy using the Aufbau principle.
Write the electron configuration stepwise: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, filling electrons until you reach 33 electrons.
Count the number of orbitals that contain electrons. Remember that each s subshell has 1 orbital, each p subshell has 3 orbitals, each d subshell has 5 orbitals, and each f subshell has 7 orbitals.
Sum the orbitals that have at least one electron in the arsenic atom based on its electron configuration.
The total number of electron-containing orbitals corresponds to the number of orbitals occupied by the 33 electrons in arsenic.
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