Crosswords16 mins ago
please will someone reply asap i need help with this big time
Answers
No best answer has yet been selected by elerrina. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.An atoms atomic number is the number of protons in it's nucleus. It has to be electrically neutral so there are the same number of electrons.
The atomic weight can at this level be considerred just as the number of protons and neutrons in the nucleus.
So take Lithium with an atomic number of 3 and an atomic weight of 6.94
It has 3 protons and 3 electrons we round the mass up to 7 and 7-3=4 so it has 4 neutrons.
Yes Gef we know that the atomic weight is not actually the combined number of nucleons because of binding energy and that the term atomic weight should be replaced with relative atomic mass based on carbon 12.
But I'm guessing the questionner isn't a final year physics student and needs the simple answer right now.
By the way, here in Scotland this is taught to year 10 pupils not final year physics students.
I'll say that again!
That's the point Gef. This is clearly a year 10 question not somebody struggling with the quantum model of the atom.
This basic model of the atom is taught down here at an early level too.
Though I've no idea why kids don't laugh and ask why the protons don't fly apart and why the electrons don't fly in and hit the nucleus.
Guess it shows how much you take on trust from teachers
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