What is the electron configuration for Fe? A. [He] 4s2 3d6

B. [Ne] 4s2 3d6

C. [Ar] 4s2 3d6

D. [Ar] 4s2 4d6

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

How many moles of oxygen react with 12 moles of aluminum