How do you increase neutrons make this true create this isotope? (Bottom Row)

Science
Tutor: None Selected Time limit: 1 Day

Nov 21st, 2015

Thank you for the opportunity to help you with your question!

neutrons=20

protons=19

in an atom the number of atoms and neutrons is always equal but the number of neutrons vary in an isotope.we got 20 by 

         39-19=20

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 21st, 2015

How do you get the -15 isotope?

Nov 21st, 2015

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