Why is it more difficult to cause photons to be emitted from neon

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

i think it is true since you can test the answer and can use observations to complete it.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.