Question

Un atom are 8 neuroni si masa reala de 2,672 • 10^-24 g.Determina:
Ajutor! Coroana!

Answer 1

a)

masa relativa a unui atom = 1,66x10la-24 g

=> A.relativa = 2,672x10la-23 / 1,66x10la-24 = 16 u.a.m.

=> A = 16 , dar A = Z + n0 => Z = 16 - 8 = 8 p+ / 8e-

b)

daca 1 at  ...................................... 1,66x10la-24 g

      n at. ............................... 534,4x10la-24 g

=> n = 534,4x10la-24 / 1,66x10la-24 = 322 atomi

c)

sarcina nucleara = 8p+

sarcina de electroni = 8e-