Which of the following isotope symbols can't be correct? (a) (b) (c) (d)

Video transcript

Hello everyone today. We have the following problem identify which among the isotope symbols below is incorrect. So here we have five isotope symbols and we have to determine which one is incorrect. The first thing we're gonna do however, is to determine what a standard symbol looks like. And so we'll start with an X. And R. X. Is going to represent our symbol for the element followed by an A. In the top left and a Z. In the bottom left. Our A. Is going to be our mass number. Nrz is going to be equal to our atomic number. And so if we start with our first answer choice or first answer which is I or one. This says that we have 40 19 and A. P. and so 19 which is our atomic number Is going to be actually representative of not having 19 protons. Which if we go to the periodic table is potassium. And the symbol for potassium is K. Not P. So answer the first Option one is incorrect. So it will be amongst our answer. And so with that we can get rid of answer choices B. And we can get rid of answer choices D. As they do not contain one And we'll go ahead and do these for the rest of them for five. We have 1 2050 and we have 10. We have our atomic number being 50. So our atomic number is 50. We go to the periodic table. This represents 10 and the symbol for 10 is S. N. So this is correct. So any answer choice with two is also going to be incorrect so we can get rid of answer choice C. We move on to the third one which is 29 63 see you. And so the atomic number for this is going to be 63. And if we go to the periodic table that's going to be representative of copper And coppers atomic number is not 63 and so three is going to be incorrect. And so we have our answer choices being one and three. And so we see that anti choice A. Doesn't include three so we can go ahead and get rid of that. And that leaves E as our only answer to include one and three. For fun. We will solve for four. That's 109 47 and A. U. The atomic number here is 47. And that actually represents silver, which silver has an atomic symbol of A. G. Not A. You. So therefore answer choice E. Is definitely correct. And with that we've entered our question overall. I hope this helped. And until next time.