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In a polyelectronic atom, which of the following has the highest energy level?
Select the correct answer below:
a. 4s
b. 3d
c. 2p
d. 3s

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theleangreenbean

Energy Levels

We can read energy levels on a periodic table simply by going from left to right down each period.

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶...

See the image below for a complete summary (taken from Wikibooks).

Each successive energy level is higher than the previous.

Thus, in the given list, 3d has the highest energy level.

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