00:01
So let's look at the lewis dot structure for ph3.
00:07
Now, most molecules follow the octet rule, which says that electrons around atoms will have eight valence electrons.
00:17
However, hydrogen is an exception and only wants two valence electrons.
00:22
So p wants a total of eight valence electrons, and each hydrogen wants two.
00:34
And it only wants two because it only has the first shell.
00:38
First shell only holds two electrons.
00:43
So we first have to figure out how many valence electrons each one has.
00:47
Phosphorus is in group 15 on the periodic table, and group 15 is a substance that has five valence electrons.
01:00
And it would look like one, two, three, four, five...