How many orbitals are filled in second period?

Answer:

The 4 orbitals filled in the second period are one 2s (with 2 electrons) and three 2p (with 6 electrons).

Electronic configuration in second period

• The second period starts with Lithium and Beryllium which have 3 and 4 electrons and hence the last electrons enter the level 2s and they have an electronic configuration of 1s²2s¹ and 1s²2s², it is followed by the start of the 2p orbital filling.
• It starts with Boron (1s²2s²2p¹) and ends with Neon (1s²2s²2p⁶) which marks the completion of the L shell.
• Thus, 8 elements are present in the second period.

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