The allowed values of n for the Li2+ ion are
a. 1 to ?
b. 2 to ?
c. 3 to ?
d. any real number
e. 1 to 10
a
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A ___________ generally contains well over 1000 galaxies and is quite dense. They often contain many giant elliptical galaxies
a. local group b. poor cluster c. rich cluster d. tidal tail e. quasar
When an object absorbs as much as it radiates
A) it remains at about the same temperature. B) it is a net absorber. C) it is a net radiator. D) none of the above
Consider the complete magnetic cycle of sunspot activity on the Sun. Approximately how many years is this cycle?
a. 100 years b. 11 years c. 7 years d. 40 years e. 22 years
A neutral atom always contains
a. the same number of protons as it does neutrons. b. the same number of electrons as it does neutrons. c. the same number of protons as it does electrons. d. twice as many protons as it does neutrons. e. twice as many neutrons as it does protons.