Do any copper isotopes have a mass of 63.546 amu? how come?

Question

doc.brown · Answer

What's an isotope?
What does a mole of copper weigh?
Would adding or subtracting neutrons change the weight?

wolfe8 · Answer

Welcome to OpenStudy. In addition to what is already asked, is that the mass given in the periodic table? How is that calculated and what contributes to the mass of an atom?

anonymous · Answer

Thank you for responding. I haven't been in school for over 12 years and I have a feeling i'll be using OpenStudy often.  So, isotopes are atoms with the same number of protons but different number of neutrons. Since I was given the mass (which i believe is the same from the periodic table), it is the sum of the protons and neutrons. If i were to change the number of neutrons then the mass would change. If the mass changes then it's a different isotope. Does that sound about right?

wolfe8 · Answer

Sounds right I think. So in conclusion, an isotope will have a different mass than that. This is, if I'm not over-simplifying the question.

anonymous · Answer

Thank you!!

wolfe8 · Answer

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doc.brown · Answer

I like ptable.com for a periodic table.  You are right, a mole of copper weighs 63.546g.  Adding neutrons increases the atom's mass.  Subtracting them decreases the mass.
Isotopes have a different number of neutrons than protons.