Each element in a column of the periodic table
A. has the same size.
B. has the same nuclear properties.
C. has the same electron configuration.
D. has the same nuclear charge.
C. has the same electron configuration.
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Radioactive Decay: What happens to the half-life of a radioactive substance as it decays?
A. It remains constant. B. It increases. C. It decreases at a constant rate. D. It decreases at an exponential rate.
There appears to be a correlation between the 22-year solar cycle and:
A) droughts in North America. B) asteroid impacts on Earth. C) change of which political party has the majority in the U.S. Congress. D) the length of Mercury's day. E) the length of Saturn's year.
An atom having a single proton in its nucleus is a hydrogen atom
a. True b. False Indicate whether the statement is true or false
A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, the amplitude of its electric field:
1.increases. 2.decreases. 3.stays constant.