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So, according to Pauli Exclusion Principle, it is better to fill up electron going in the same direction first as they would have lower energy potentials. So instead of filling up the 1px orbital completely, he added the other electron to the 1py orbital, as there is less energy.
Both are correct, but the other one is more specific since it showed each electron in each subshell. The problem in the first one is that one could misunderstand and put 2 electrons in one subshell before filling all of the other ones first.
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