Write about the electronic configuration of 1st and 2nd period.

1.	Write about the electronic configuration of 1st and 2nd period.
Answer» Electronic configuration of 1^st period: In 1 period only two elements are present. This period starts with the filling of electrons in first energy level, n^-1 . This level has only one orbital as is. Therefore it can accommodate two electrons maximum. Electronic configuration of 2^nd period: In the 2’ period 8 elements are present. This period starts with filling of electrons in the second energy level, n = 2. In this level four orbitais (one 2s and three 2p) are present. Hence the second energy level can accommodate 8 electrons. Thus, second period has eight elements.

Answer»

Electronic configuration of 1^st period:

In 1 period only two elements are present. This period starts with the filling of electrons in first energy level, n^-1 . This level has only one orbital as is. Therefore it can accommodate two electrons maximum.

Electronic configuration of 2^nd period:

In the 2’ period 8 elements are present. This period starts with filling of electrons in the second energy level, n = 2. In this level four orbitais (one 2s and three 2p) are present. Hence the second energy level can accommodate 8 electrons. Thus, second period has eight elements.

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