What causes the largest variation in the atomic masses of various isotopes of an element? A.
varying numbers of protons
B.
varying numbers of neutrons
C.
varying numbers of electrons
D.
varying masses of the nucleons

Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

Energy is the ability to do work which measures what

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?