na find electronic configuration
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As an example, the ground state configuration of the sodium atom is 1s2 2s2 2p6 3s1, as deduced from the Aufbau principle (see below). The first excited state is obtained by promoting a 3s electron to the 3p orbital, to obtain the 1s2 2s2 2p6 3p1 configuration, abbreviated as the 3p level.
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Atomic no. of Na = 11
hence its electronic configuration
k - 2
L - 8
M- 1
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