yahvicky
yahvicky yahvicky
  • 05-10-2020
  • Chemistry
contestada

can anyone answer these?

can anyone answer these class=

Respuesta :

wiam260405 wiam260405
  • 05-10-2020

Answer:

18 is a

19 is c

20 i am not sure

Explanation:

18)nucleus contains protons and neutrons

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