00:01
Hi there.
00:02
We are trying to determine where this element belongs on the periodic table.
00:10
So as we look at the periodic table and our answer choices, this region here, these are the transition metals.
00:27
Alkalide metals are the first group on the periodic table.
00:35
Noble gases are over here in group 8a or group 18.
00:46
Representative elements are the tall group elements, so groups 1a through 7a.
00:53
So i'll just put a little r at the top of each of their columns for representative elements.
01:00
All of these are representative elements and an actinide element that would be in the actinide series here.
01:12
Okay, so to determine what we have, let's look at this configuration.
01:16
When we see kr in brackets, that represents the elective.
01:20
Electrons that are found in krypton, the core electrons, in other words.
01:26
And krypton is atomic number 36.
01:28
So that means it has 36 protons, and therefore 36 electrons.
01:34
And then we look at the configuration beyond there...