00:01
So here this problem gives us some information about an element in relation to the periodic table, and it wants us to find what that element is.
00:09
So our first problem tells us that we have a period 2 alkaline earth metal.
00:16
So let's go to the alkaline earth metals, which are these orange ones right here in the second column.
00:21
And it tells us that it is in period 2.
00:24
So period 2, alkaline earth metal right here, that's brilliant.
00:28
So b, b, e.
00:34
Okay, i know the next one.
00:36
Next one says that we have period three, and it is in group 15, or sometimes referred to as group 5a.
00:43
You'll see both, and so period three, in group 5a or 15...