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atomic weight - protons = neutrons,
Na-23 has an atomic weight of 23 amu, and 11 protons so 23-11=12 neutrons
Justus Rau β
23 of them
23/12
23 hours is 82,800 seconds.
23 hours is not a whole day
23 days.
23.2=
23 000.
23
Two: 1 and 23
23 of them.
There are 2 tens in 23
23 ! ! ! !
23 hectometers is 230,000cm
23 " = 584.2 mm