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Chemistry - help urgent

did Mendeleev sort out the elements in order of Mass number or Atomic number , I'm so confused as the revision guide is saying both
(edited 3 years ago)
In order of increasing relative atomic mass.
Original post by jadeitestar
In order of increasing relative atomic mass.

so that's mass number right?
Original post by TrishaChou1
so that's mass number right?

Yes
Original post by TrishaChou1
so that's mass number right?


There’s actually a slight difference. The mass number is the sum of protons and neutrons in the nucleus of a specific atom, whilst the relative atomic mass is a weighted average of the mass numbers of different isotopes. It’s more accurate to say “relative atomic mass”.
Original post by jadeitestar
There’s actually a slight difference. The mass number is the sum of protons and neutrons in the nucleus of a specific atom, whilst the relative atomic mass is a weighted average of the mass numbers of different isotopes. It’s more accurate to say “relative atomic mass”.

okk thnxx

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