2x-42 = -40
1x84 2x42 3x24 4x21 6x14 7x12
1x84 2x42 3x28 4x21 6x14 7x12
1x84 2x42 3x28 4x21 6x14 7x12
2n2 = 2x42 = 32 electrons
-76
Well, honey, buckle up because we're going on a wild ride through the multiplication table. The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, and 84. So, basically, any combination of those bad boys will give you a sweet 84. Math can be a real trip, can't it?