 Okay, let's do this second one and this will be the last one of these that we do for today, but we'll address that question and we got asked off-camera that we didn't hear on camera, but it was a good question, so let's talk about it. So let's do 10 and we'll go through the same analysis and then when we get to that point, we'll talk about that unit, but anyways, so based on the information available on the periodic table, what is the elemental symbol of 10? Okay, so 10 is a weird one, but remember elemental symbols are either one or two letters and 10 is two letters, the second letter is always lower case, and a lot of times they'll go along with what you would expect them to be in the English, speaking English about the elements, but they don't always, as you can see, 10 is Sn and it has to do with the history of the naming of 10, Stannis and things like that. You'll hear that term Stannis in referring to 10 if you go on in chemistry a lot more, but anyways, so the elemental symbol of 10 is this Sn, the atomic number of 10 is here, it's 50, remember it's the 50th element on the periodic table, the atomic weight of 10, so this is where the question was, the atomic weight, like we said, was a weighted average, so 118.710, and actually there's units associated with that, so 118.710 Dalton's is the unit that's currently being used, there's a somewhat antiquated but fairly, I don't know, well used alternative to Dalton and it's AMU, and it means atomic mass unit, and in fact there's a conversion factor, 1 Dalton equals 1 AMU, and so in this case it would be 10710 AMU, that's how much the average 10 atom weighs, but anyways this is just Dalton, so a lot of my problems I think I use AMU because the book that I've been using used AMU, but anyways we really should talk about Dalton's too, because Dalton is in reference to John Dalton, the father of atomic theory or whatever, so that's kind of his little thing, but anyways, so if you want to remember these numbers do have units behind them, and that's the units, I don't want to do this way, so how many protons does tin contain, well it's going to be the same as the atomic number, so number of protons is 50, how many electrons does it contain, well it contains the same number of protons as it does electrons, so 50, is tin a metal, metalloid or non-mister case, but it's actually right to the left of it, so in fact tin is way down in the barotic table if you're looking at it, so this is usually found in group 4a or 4 question, but we