tumininuakinleye423 tumininuakinleye423

18-05-2021
Chemistry

contestada

6.
What are the mass numbers of; hydrogen, helium
and boron? I
승

Respuesta :

lailai210 lailai210

18-05-2021

The mass number of hydrogen is 2

The mass number of helium is 4

The mass number of boron is 7

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