Posted by Jean on Saturday, July 24, 2010 at 4:59am.
I would really appreciate help with the following, as I don't understand how to work it. Thank you in advance for explaining it to me.
The mass number (A) of a nuclide is equal to the number of  blank  in one of its nuclei. There are 4 answers to choose from: Protons, Neutrons, Protons+neutrons, or neutrons+electrons?

Chemistry  DrBob222, Saturday, July 24, 2010 at 12:50pm
The atomic number of an element tells you how many protons there are in the nucleus. The atomic number is the number on the periodic table that increases by 1 from one element to the next. Check it out. The mass number of an element is the number of nucleons for that element. Nucleons is not one of the answers listed in your problem but nucleons is a way of saying "protons + neutrons"' i.e., the total of what is in the nucleus.

Chemistry  Jean, Saturday, July 24, 2010 at 1:57pm
Thank you, DrBob. I am not understanding what is meant by the "nuclide"?

Chemistry  DrBob222, Saturday, July 24, 2010 at 2:51pm
Just substitute the word "element" or "nucleus" or "atom" for nuclide.
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