Which of the following statements correctly describe the organization of the periodic table? (select all that apply.)

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Video Transcript

Hi there. In this question. We have five statements about the periodic table and we need to determine which of these are correct and by default which ones are incorrect. So I am going to label these A B c d E n E just so that we know which one we're talking about as we go through these. So the first one that I'm calling letter A says some groups on the periodic table are given special names and that's true. Groups are the vertical columns. And we know for example that this last, this seventh this group over here that starts with flooring is known as the intelligence. The last group are the noble gasses. We have the alkali metals over here in Group one A. The alkaline earth in two. A. So yes, some of the groups do have special names. So that one is correct. So we would want to select the first one. The 2nd 1 says the groups are numbered 1- seven. As I mentioned a moment ago. Groups are the vertical columns. There are 18 groups. So those are not numbered one through 7. What's number one through 7 are the horizontal rows which are the periods. So the periods are numbered one through 7. So the second statement here is incorrect. Alright, The third statement says the horizontal rows of the periodic table are called periods. Well, yes, we just talked about that. We said that the horizontal rows, Our periods and there are seven of those. So that one is also correct. The next one says the elements in the large lower left portion of the periodic table are metals. And yes, that is true. The metals are separated from the non metals on the periodic table by a staircase shaped line that we see over here to the right, these elements in the large lower left portion of the periodic table are in fact the metals, So that one is correct. The non metals are above that staircase line and to the right to the right above last one says elements in the periodic table are arranged in order of increasing atomic mass. That by today's standards is incorrect. The original periodic table produced by Mendeleev did arrange them by atomic mass increasing atomic mass. But once we found out about protons and we arranged them by the number of protons known as the atomic number. And for most places in the periodic table it is true that the atomic masses are increasing. But there are a few places that that is not the case. Um for example, copper and zinc, copper has a greater mass than zinc by just a little bit. But it's still the way that's not the pair I'm looking for. I'm sorry, it's a pair right there somewhere. It's actually cobalt and nickel. Sorry about that. Cobalt and nickel. The pair I was looking for. If you look at Cobalts mass, my glasses are not doing me a good job here. But if you look at Cobalts mass, It's 58.93. If you look at Nickel, its 58.69. So these are definitely not arranged in order of atomic mass. Many of them are, but not all of them. There are a couple other places on the periodic table where again, they're not arranged by mass. So our correct statements are the first statement, The 3rd statement and the 4th statement. Alright, thank you so much for watching. And I hope this was helpful.

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