If A=23 and Z=11 for Na atom, how many neutrons are present in Na atom?
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A=23, Z=11
No of electrons=No of protons = Z
Number of electrons outside nucleus =11
No of neutrons= A-Z =23-11 =12
How many unit cells are present in a cubic -shaped ideal crystal of NaCl of mass 1.00 g [Atomic masses: Na= 23, Cl = 35.5]