Multiple Choice
Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which noble-gas symbol is used in the noble-gas notation for the electron configuration of tin (Sn)?
A
[Ar]
B
[Kr]
C
[Xe]
D
[Rn]
Verified step by step guidance1
Identify the atomic number of tin (Sn), which is 50. This tells us tin has 50 electrons in its neutral state.
Recall that noble-gas notation uses the electron configuration of the nearest noble gas with fewer electrons than the element to simplify the configuration.
List the noble gases and their atomic numbers: Argon (Ar) = 18, Krypton (Kr) = 36, Xenon (Xe) = 54, Radon (Rn) = 86.
Determine which noble gas has an atomic number less than 50 but closest to it. Since Kr has 36 electrons and Xe has 54, Kr is the correct choice.
Therefore, the noble-gas symbol used in the noble-gas notation for tin is [Kr].
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