Question

How many orbitals are filled in the second period?

Answer 1

Orbitals filled in the second period:

• The modern periodic table includes 7 periods or horizontal rows.
• The elements are placed in accordance with their electronic configuration.
• The first row of the periodic table has 2 elements in which the K shell is filled with 2 electrons.
• The second row includes elements from Li to Ne. Their electronic configuration starts from $2{\mathrm{s}}^1$and ends with $2{\mathrm{s}}^2,2{\mathrm{p}}^6$.
• $\mathrm{s}$ subshell contains one orbital while $\mathrm{p}$ subshell contains three orbitals.

Therefore, four orbitals are filled in the second period.