MediumPhysics
How many neutrons are in a sodium-23 nucleus, ²³₁₁Na?
TL;DR
The nucleus contains 12 neutrons.
Question
Find the number of neutrons in the nucleus of ²³₁₁Na.
Explanation
The mass number A = 23 is the total number of protons and neutrons. The atomic number Z = 11 is the number of protons.
The neutron count is therefore:
N = A − Z = 23 − 11 = 12.
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