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Question
State the atomic number and mass number of \[\ce{^23_11Na}\] and draw its atomic model.
Diagram
Short Answer
Solution
Atomic number Z = 11
Mass number A = 23
A = Protons + Neutrons
23 = 11 + Number of neutrons
Number of neutrons = 23 - 11 = 12
Atomic model of sodium Na
11 = 2, 8, 1
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