00:01
All right, so we want to fill out this chart, which basically has names, symbols of elements, and then information about the subatomic particles within the atoms.
00:12
The periodic table here for reference.
00:15
All right, for number one.
00:15
So, al, that's going to be aluminum.
00:22
And then the atomic number, if we look on the periodic table, is 13.
00:26
That's going to be equal to the number of protons always.
00:30
Number of neutrons is the mass number minus atomic number.
00:33
And minus 13 is 14.
00:36
Number of electrons, these are atoms, not ions.
00:39
So number of electrons and protons will always be the same thing.
00:42
So this is also 13.
00:44
All right.
00:45
Now we have something with atomic number 12.
00:48
So that's going to be magnesium mg.
00:58
So the number of protons is 12 and number of electrons is also 12.
01:01
If we have 12 neutrons as well, we can add protons and neutrons to get our mass number, which is 24.
01:08
Okay.
01:08
For number three, potassium, the symbol is k.
01:11
And then the atomic number is 19...