Question

Certo átomo tem número atômico igual a 7x + 3 e número de massa igual a 10x -1 . Determine o valor de x, sabendo que esse átomo tem 17 nêutrons. Represente na forma ZXA ​

Answer 1

$\Large\boxed{\begin{array}{l}\rm Representac_{\!\!\!,}~\!\tilde ao\,gen\acute erica: _{Z}\!\!X^An\\\rm Z=7x+3\\\rm A=10x-1\\\rm A=Z+n\longrightarrow n=A-Z\\\rm n= 10x-1-(7x+3)\\\rm n=10x-1-7x-3\\\rm n=3x-4\\\rm como~n=17~temos\\\rm 3x-4=17\\\rm 3x=17+4\\\rm 3x=21\\\rm x=\dfrac{21}{3}\\\\\rm x=7 \end{array}}$