00:01
Okay, so we're asked to for this question to write the formula of this compound.
00:10
So let's start with part a.
00:12
So potassium has the symbol k and it has a minus charge.
00:18
So k and a one minus charge.
00:22
Whereas sulfur, it's in group 1, 3, 4, 5, 6, 16, and it has a 2 minus charge.
00:34
So we have, so this is a 1 plus charge.
00:37
And s 2 minus.
00:40
So this combines to make k to s.
00:43
And now we have potassium again.
00:45
It's k plus.
00:48
Selenide is selenium, which has the charge 2 minus.
00:57
So we have k to s .e...