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In this video, we want to write the atomic symbols for the three isotopes of hydrogen.
00:06
So all of them are going to have the chemical symbol of hydrogen, which is h.
00:12
And then the atomic number is going to go on the bottom, and the mass number is going to go on the top.
00:19
So we have the first one is proteum, and we're told that it contains one proton.
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So the atomic number is one, and it contains no neutrons.
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So the mass number, the some of the protons and neutrons, is also 1.
00:33
So we have 1 .1 .h.
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Then we have deuterium.
00:40
And deuterium contains one more neutron than proteum.
00:44
So it's still going to have an atomic number of one.
00:47
They all do because they're all hydrogen, and the atomic number is the same for all isotopes of the same element.
00:53
And if it contains one more neutron, then the mass number is going to be 1 plus 1, which is 2...