00:01
So we're given information about some elements and we're being asked to figure out what element is being described if we know that it is located in the third period or the third row of the periodic table.
00:15
So we're only paying attention to the elements that fit within this row here from sodium all the way over to argon.
00:23
So our first one is saying which one has three valence electrons.
00:28
Using the periodic table, we can tell what the number of valances based upon the location.
00:35
Group 1 has 1, group 2 has 2.
00:39
We kind of skip the transitional metals because they have multiple versions.
00:44
So we skip on over to 13, which has 3.
00:48
That looks bad.
00:50
There we have 3.
00:51
Carbon has 4.
00:52
The nitrogen group has 5.
00:54
Oxygen has 6.
00:55
Halogens have 7.
00:57
And noble gases except for helium have eight.
01:00
So if we're being asked which element in period three has three valence electrons, our answer is going to be aluminum because it's right here, three valence period three...