Respuesta :

  • No of protons=30
  • No of neutrons=30

Mass number=No of protons+No of neutrons

[tex]\\ \sf\longmapsto Mass\:No=30+30[/tex]

[tex]\\ \sf\longmapsto Mass\:No=60[/tex]

Explanation:

Here,

Protons(p+)=30

Neutrons(N⁰)=30

We know,

Atomic mass(z)=(P+)+(N⁰)

=30+30

=60