RudleyMillia
RudleyMillia RudleyMillia
  • 12-10-2016
  • Chemistry
contestada

What is the total number of neutrons in the nucleus of a neutral atom that has 19 electrons and a mass of 39?
a. 19
b.20
c.39
d.58

Respuesta :

olabido
olabido olabido
  • 18-06-2018
20 because
mass no=electrons+neutrons
so to find neutrons
mass no-electrons=neutron
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