00:01
In this question, we've been given a set of elements in each question.
00:05
We have a set of elements or atoms and we've been asked to arrange them in order of increasing atomic radius.
00:13
So for us to answer this question, before we answer, let's just have a guideline.
00:16
That is the atomic radius.
00:18
It increases when we go down the group in the period table.
00:25
And it also increases when we go from the right to the left across.
00:31
A period.
00:34
So all we have to do to answer this question is to just look at the arrangement of these atoms relative to each other in the periodic table.
00:43
We look at those atoms and we apply this general guideline.
00:49
Just to apply this, let's look at the first one.
00:51
If we look at the atoms or elements that we have been given, all of these elements they belong to the same group, that is group 8.
00:59
So we can use the first guideline to say the in atomic radius, it increases going down the group.
01:05
So what we are going to have is the atomic radius of helium is less than that of neon, which is less than that of a .r., which is less than that of kr, where our kr has said the highest atomic radius, because it is furthest down the group...