00:01
So let's just say this guy right here is a proton.
00:04
And this guy right here is a neutron.
00:07
So these guys are forming the nucleus.
00:10
Around the nucleus is our orbital, with our electrons in them.
00:18
So what contributes to the mass of an atom? well, that's the protons and neutrons.
00:24
Electrons don't count because they're so small.
00:27
In fact, a proton is about 1 ,850 times the size of an electron.
00:35
That's so big compared to an electron.
00:39
Electrons are just too small to be counted for in the mass of an atom.
00:45
So proton plus neutron equals mass.
00:54
Now protons and neutrons are important, but what counts for the chemical reactions that occur between atoms are the electrons, specifically the valence electrons.
01:03
So let's say these are now our valence electrons.
01:05
We have this guy come over with his valance electrons and he needs to borrow an electron in order to fill up his outer ring...