PiperezTerry
PiperezTerry PiperezTerry
  • 19-10-2016
  • Chemistry
contestada

A helium atom has 2 protons and 2 neutrons.what is the mass number of this atom?

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madisonlopez99
madisonlopez99 madisonlopez99
  • 19-10-2016
4. Just add the protons and neutrons together.
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