Question

4.Um átomo apresenta 40 elétrons e 65 nêutrons,
qual é o valor de Z e A?

Answer 1

$\Large\boxed{\begin{array}{l}\sf No\,estado\,fundamental~Z=p=e\\\sf portanto\,Z=40\,e\,p=40\\\sf A\,massa\,\acute e\,a\,soma \,de\,pr\acute otons\,com\,n\hat eutrons.\\\sf A=p+n\\\sf A=40+65\\\sf A= 105\,\end{array}}$