One Line Answer
The atom of aluminium is represented by 27Al13. Write down the number of protons in the different orbits or shells in one atom of aluminium.
27Al13 Ato,ic mass = (P + n) = A
Atomic number 13 = P = e = Z
Number of protons = Z = 13
Concept: Electrons Distributed in Different Orbits (Shells)
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