Problem: Does the electron configuration 1s22s22p43s1 correspond to an excited state? Identify the atom and write the ground-state electron configuration if appropriate. How many unpaired electrons are present in this species?

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FREE Expert Solution

Recall that: 

s–subshell can hold a maximum of 2 electrons

p–subshell can hold a maximum of 6 electrons

d–subshell can hold a maximum of 10 electrons

f–subshell can hold a maximum of 14 electrons


When filling up the orbitals, take note of:

• Aufbau Principle: totally fill in the lowest energy orbital first

• Hund’s Rule: electron orbitals that are degenerate (same energy orbital) are first half-filled before they are totally filled


The orbital diagram is:

Lower level (2p) orbital is not yet filled but Higher level (3s) orbital has 1 electron

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Problem Details

Does the electron configuration 1s22s22p43s1 correspond to an excited state? Identify the atom and write the ground-state electron configuration if appropriate. How many unpaired electrons are present in this species?