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lfbella lfbella
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11 years ago
One isotope of Hydrogen has an atomic number of one and a mass number of three. How many protons, neutrons and electrons does this isotope have?
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#1
11 years ago
atomic number =1= number of protons

atomic mass = mass of protons + mass neutrons = # protons + # neutrons {since mass of protons = mass neutrons = 1 amu}
3 = 1 + # neutrons
# neutrons = 3-1 = 2

# electrons = # protons =1 for a neutral atom.

so this atom has 1 proton, 2 neutrons, and 1 electron.   it's name is tritium
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#2
11 years ago
The only one I can think of is tritium:
proton = 1, and of course electron = 1,
but 2 neutrons.

The mass is approx. 3 u.
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#3
11 years ago
There is no isotope of hydrogen with that weight.

With two neutrons its weight is 3.0160492675
If you remove its lone electron of about .0005446623
That leaves an atomic weight of about 3.0155046

This isotope is called tritium and is too heavy for your answer of 3.
However, with a little rounding, it may serve.
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