[He] 2s one
The element argon (atomic number 18) has the electron configuration 1s22s22p63s23p6 which can be abbreviated [Ne] 3s23p6
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1s2 2s1
1s22s1
the abbreviated electron configuration of sodium is (Ne) 3s1
abbreviated electron configuration = e.c.
The abbreviated electron configuration of sodium is [Ne]3s1.
The electron configuration of boron is [He]2s2.2p1.
The element argon (atomic number 18) has the electron configuration 1s22s22p63s23p6 which can be abbreviated [Ne] 3s23p6
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[Kr]
The electron configuration of nobelium is [Rn]5f14.7s2.
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1s22s1
1s2 2s1
1s22s1
the abbreviated electron configuration of sodium is (Ne) 3s1