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ns2np3

2nd answer :

outer electron configuration is the same as valence electron , you can easily find it in the period table : using the number of the group :

Group 1 : one, Group 2 :two , Group 3-12 cannot be found instead d electron count is used , group 13 : three , Group 14 : four ans so on until Group 18 : Eight

So oxygen is in group 16 so it has 6 outer electron configuration or look to the Nobel gas notation : [He] 2s2 2p4 so count the power of last orbitals 2s 2p so : 6

Read more: What_is_the_outer_electron_configuration_for_aluminum

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