00:01
In this problem, we're asked to envision a universe in which six valence electrons rather than eight is a particularly stable configuration.
00:10
And we're asked to give an example of each of these types of elements, assuming that the elements stay the same.
00:17
So firstly, noble gas.
00:18
So what defines a noble gas in our universe? well, clearly, except for helium, a noble gas has eight electrons in its valence shell.
00:27
With helium, it's just got a full valence shell, which is, of course, only.
00:30
Two electrons.
00:31
So the noble gas is in a universe where six electrons is particularly stable, that is something that would be non -reactive in general, will be anything with six valence electrons.
00:45
So we can give an example of oxygen, we can get an example of sulfur, even though it typically doesn't exist in a gaseous state, same for selenium.
00:56
But the chief example they're trying to get you at is is oxygen here being a non -reactive substance.
01:06
We could also make an argument that helium would be non -reactive due to having a full valence shell and only an s -orbital, but when six -valence electrons is particularly stable, we can assume that orbital theory would have to change to accommodate that.
01:23
Next up is a reactive non -metal...