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### (a) Which two of the following are isotopes of th…

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Manhattan College

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Problem 25

(a) Define atomic number and mass number. (b) Which of these can vary without changing the identity of the element?

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## Video Transcript

is your problem. 25 Chapter two So define atomic number and mass number. So let's say we have our elopement. Let's say element X. Our atomic number is going to be down here. This is Z and our master number. Let's call it Big M. And our atomic number refers to the number of protons in the nucleus of this Given Adam X, the mass number, the mass number refers to the number the the mass number. Our refers to the total number of protons and neutrons and nucleus. So the mass number is just the atomic number plus the number of neutrons. No, which of these can very felt changed the identity of the element That was gonna be our mass number. So you can have this. I have two ends of the same element, but they can have different mass numbers. These air water, known as isotopes you have you have, for example, carbon that has in a top mass number of 12 and carbon as a mass number 14 your atomic number. If your atomic number changes, you get a completely different element, like you can't have one carbon atom that's six protons and another carbon of that seven protons. Because the protons number project that terms the chemical identity of the element