00:02
Hi there.
00:03
In this question, we have some generic electron configurations, and we want to know which one we would expect to belong to a noble gas and which one we would expect to belong to a metalloid.
00:15
So let's start out with the periodic table and identify the s block, which is the first two groups on the periodic table, and the p block.
00:30
The p block are the last six groups on the far right of the periodic table, with exception of heelock.
00:37
We'll talk about that in a moment.
00:39
Let's go back to the s block.
00:41
The s block means that the last electron in the configuration enters into an s -orbital.
00:48
So for group 1, the last electron goes into an s -1, and for group 2, the last electron goes into an s2.
00:56
The p -block means that the last electron goes into p1 through p6.
01:07
And i mentioned that helium is an exception.
01:10
Helium only has two electrons.
01:13
So therefore, its second and final electron enters an s2.
01:20
Okay.
01:22
The transition metals are the d block and the inner transition are the f block, but we don't need those for this question.
01:30
So i'm just going to mention them and move on.
01:33
Okay, so the first question, we want to know which of those following outer electron configurations would you expect to belong to a noble gas? all right.
01:43
So we have a noble gas.
01:49
And i would expect the ones that end with p6.
01:53
So that is letter b.
01:56
So that's ns2 and p6.
02:03
So that is the best answer there.
02:07
And i say best answer because there is one scenario in which letter a would work.
02:14
And that is if we're talking about helium...