00:03
Hi there.
00:04
In this question, we are comparing carbon 14.
00:07
So that would look like this would be c with a 6 because the 6 is the atomic number.
00:20
And then the 14 that we are given would go as a superscript above it.
00:25
We're writing the isotopic symbol and that is the mass number.
00:31
All right.
00:32
So we are comparing carbon 14 and carbon 12.
00:41
So 12 means the mass number again.
00:45
Since its carbon is going to have the same atomic number, which is six.
00:49
Now recall the atomic number tells us the number of protons.
00:58
All right.
00:58
So if we are comparing the carbon 14 and the carbon 12, they both have the same atomic number.
01:11
So they're each going to have six protons.
01:13
Okay, mass number is the sum of the protons plus the neutrons.
01:20
Therefore, carbon 14 is going to have 14 as the mass number.
01:25
If we subtract the number of protons, which is six, that will give us eight neutrons.
01:31
For carbon 12, mass number of 12 minus six protons gives us six neutrons.
01:38
Okay, so from this information, then we should be able to answer this question...