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Li
3
Z = 3 (número atómico)
A = 6 (número másico (6.9 = 7)
n⁰ (neutrones) = A - Z
protones = electrones = 3
n⁰ = 7 - 3 = 4
NOTA LA MASA ATOMICA DEL LITIO ES 6.941 = 7
b)57
Fe
26
n⁰ = 57 - 26 = 31
protones = electrones = 26