Question

the shape of orbit present in 3rd orbit​

Answer 1

The 3rd shell where n=3 has the orbitals 3s + 3p + 3d. The s sub shell has 1 orbital while p sub shell contains 3 orbitals and d sub shell has 5 orbitals. If we add them up we get an overall of 9 orbitals.

hope it helps

For the number of electrons that can be present in the 3rd shell, we use the 2n^2 formula. So that means (3s = 2) + (3p = 6) + (3d = 10) = 18