Continuing on the same basis, the electronic configurations of nitrogen (Z = 7), oxygen (Z = 8), fluorine (Z = 9) and neon (Z =10) can be written as shown below:
Second Row Elements
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In lithium (Z =3), the third electron goes to the next 2s orbital. In Beryllium (Z = 4), the fourth electron fills 2s orbital and in boron (Z = 5), the next electron goes to the next available 2p orbital. In carbon, the sixth electron is also to go into the 2p orbital as 2p subshell can accommodate six electrons. Here the Hund's rule of maximum multiplicity applies. In other words, the electrons enter the orbitals of same energy with parallel spin until all are singly filled. Thus, in accordance with Hund's rule, the differentiating electron must be placed in either 2py or 2pz,orbital.
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