00:01
So for each of these questions, we can look at the periodic table.
00:04
So for a, we have an element in period three, right, which is just period is the row.
00:11
So row three and group 6a.
00:14
So if we group is the column, so we go to the column 6a.
00:20
And where those intersect, it looks like it's sulfur.
00:25
It's atomic number 16, which yes is less than 90.
00:32
And then what is a symbol that matches, right? our symbol is sulfur.
00:38
Next, for b, we have an element for a metaloid that is in group 4a.
00:43
So if we go to group 4a, remember group is the column.
00:47
So group 4a and then a metalloid.
00:49
So remember the metalloids, we do that stair step kind of right in the middle.
00:56
So if we have a group for metalloid, it's going to to be either silicon or geranium.
01:08
Silicon has a atomic number 14, which yes, is less than 92, and so an element would be silicon.
01:19
Part c, the element is in the nitrogen family.
01:23
So a family is kind of like a group.
01:25
So nitrogen is here in group five...