22georgej 22georgej

16-09-2018
Physics

contestada

an atom has 14 protons and 15 neutrons, what is its mass number?

I'm desperate 20 pts.

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dreyes24 dreyes24

16-09-2018

The amount of protons is the same as the atomic number. You look for 14, silicon, and look at the mass, 28.086

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michellebweston michellebweston

16-09-2018

Mass number = protons + neutrons

14+15 = 29

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