Which diagram most correctly shows the portion of Earth that is illuminated by sunlight and the portion that is in shadow on the first day of summer in the
Northern Hemisphere?
[Key:
1- illuminated
1-shadow, NP = North Pole]
NP
NP
Arctic Cide
Arctic Cirde
Equator
Equator
(1)
(3)
NP
Arctic Code
NP
Arctic Cade
Equator
Equator
(2)
(4)
2
3

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?