00:02
Hi there.
00:03
In this question, we are given an element, a main group element, with an electron dot structure, a lewis structure that shows just one valence electron.
00:14
One dot means one valence electron.
00:17
So as we look at the periodic table, as we look at the main group elements, their number of valence electrons corresponds to the group number.
00:25
So group 1a has 1, 2a has 2, 3a has 3, and so forth, all the way up to the noble gas.
00:33
Which have eight valence electrons, except for helium, because it only has one energy level.
00:39
Okay, so with just one dot, that means we are looking at group 1a.
00:47
And we're told that the element is in period three...