Multiple Choice
How many valence electrons are present in a neutral atom of chlorine?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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For the element arsenic (As), how many electron shells are completely filled in its ground state electron configuration?
A
4
B
3
C
2
D
5
Verified step by step guidance1
Identify the atomic number of arsenic (As), which is 33. This tells us arsenic has 33 electrons in its neutral ground state.
Write the ground state electron configuration of arsenic by filling orbitals in order of increasing energy: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p.
Determine the electron configuration: $1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^6\ 4s^2\ 3d^{10}\ 4p^3$.
Count the number of completely filled electron shells. A shell is completely filled if all subshells in that principal energy level are fully occupied. For arsenic, shells 1, 2, and 3 are completely filled.
Conclude that arsenic has 3 completely filled electron shells in its ground state electron configuration.
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