00:03
So this question is asking us about how many protons and electrons each of these elements has.
00:10
And so what you should be looking at is if you find your periodic table and you find the particular element, so let's say that it was lithium, you would find your periodic table square looks something like this.
00:30
And the number of protons is the atomic number, which is this number right here in the upper left corner.
00:39
So that's essentially what you're doing is you're looking for each of these elements on your periodic table, and you're looking at the number in the upper left corner.
00:46
The number of electrons has to be the same as the number of protons, because they've told us that it is a neutral atom, which means that the number of protons and electrons, the charges, positive and negative charges, have to cancel out.
01:04
So without further ado, the first one is argon.
01:08
So if we find argon on the periodic table, we find that it's on the very right -hand side.
01:15
And the atomic number for argon is 18.
01:20
So argon has 18 protons and 18 electrons.
01:28
The second one is manganese...