00:01
Hi there.
00:02
In this question, we are trying to classify each of these elements as a metal, a non -metal, or a metalloid.
00:11
So to do this, we are going to enlist the use of our periodic table because our periodic table separates elements into their different types if you know where to look.
00:21
And what we need to look at is some periodic tables have this on there already, but a little zigzag or staircase line that starts over here towards the road.
00:32
Between boron and aluminum.
00:35
And it goes over and down and over and down and over and down.
00:40
To the left of that line are the metals, including, of course, the inner transition, because they are also to the left of that.
00:50
To the right of that line, we have the nonmetals.
00:56
There is one exception that we need to remember, and that is that hydrogen is actually a non -metal.
01:04
So that line definitively, separates metals from non -metals.
01:08
But some of the elements that lie along that line, they can't decide if they're a metal or non -metal.
01:14
They have some properties of each.
01:16
So they're referred to as semi -metals.
01:19
So that would include boron.
01:21
Not aluminum.
01:22
Aluminum is pure metal.
01:25
But most of these others that touch this line are considered semi -metals or metalloids.
01:34
Okay, polonium, again, is not considered a metaloid or a semi -metal.
01:39
The ones down here at the bottom, these have just been added recently, so i'm not even positive exactly if they're metalloids or not.
01:47
In fact, these names i do not see in most places except on this periodic table.
01:53
But let's go with what we know, because that's all we need to answer this question.
01:57
So we want to separate these into metals, non -metals, and are semi -metals...