Multiple Choice
Some chemicals which are exposed to sunlight will continue to glow even when they are placed in a dark room.This phenomenon is known as
A) alpha emission.
B) beta emission.
C) fluorescence.
D) X-rays.
Correct Answer:

Verified
Correct Answer:
Verified
Q39: In which group do all atoms have
Q40: The element iron (Fe)occurs naturally as four
Q41: How many electrons are there in a
Q42: Which element is in the same period
Q43: The line spectra of atoms provides experimental
Q45: Group 2A elements are called<br>A)alkali metals.<br>B)alkali earth
Q46: Which orbital will have the lowest energy?<br>A)3d<br>B)3p<br>C)4s<br>D)2p
Q47: Which orbital will have the highest energy?<br>A)4d<br>B)4f<br>C)4p<br>D)4s
Q48: Excited state electrons lose energy when they
Q49: A cation is a<br>A)negatively charged ion.<br>B)positively charged