Question

59. The total number of orbitals in the principal shell of He+
5
hcR
that has energy equal to
,is (R = Rydberge constant)
4
(1) 4
(2) 16
(3)9
(4) None of these
3​

Answer 1

mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density.