The atomic number is the atomic mass
number of neutrons
protons plus the neutrons
number of protons
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to force terrorists groups to stop attacking western targets using massive military force.

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.

written by alan ward and published in 2003. ward is a historian and was a professor at the university of connecticut.

if this isn't what you are looking i would like to know more details.