Do Different Materials with the Same Mass Have the Same Number of Protons?

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1 kg of iron contains the same number of protons as 1 kg of aluminum, hydrogen, or wood when comparing their atomic structures, but the total mass is defined by the number of protons and neutrons (P + N) in each element. Neutrons have a mass nearly equal to protons, making it feasible to define mass based on these particles. The binding energy in atomic nuclei introduces minimal errors, typically under 1%. Understanding the relationship between mass and atomic composition is crucial for accurate scientific measurements. This discussion highlights the importance of protons and neutrons in defining the mass of different materials.
bolbol2054
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my question is
Does 1 kg of iron contain the same number of protons as 1kg of aluminium,hydrogen and wood
Can we define mass of matter with no of protons and neutrons it contains?
 
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Hi bolbol2054! :smile:

A neutron weighs almost exactly the same as a proton, and most elements have more neutrons than protons, so you would have to define mass of matter with the number of protons and neutrons (P + N) it contains.

If you did, it would be pretty accurate …

the errors (due to "binding energy") would be well under 1%: see the tables in http://en.wikipedia.org/wiki/Bindin..._experimentally_measured_atom_nuclide_masses" for some detailed figures. :wink:
 
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thank you sir
 
don't call me sir!

i'm only a little goldfish! :biggrin:​
 
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