Question

calculation of atomic mass number.if the proton number is 6.

Answer 1

atomic mass = proton *2
=6*2
=12
thus the element is carbon

Answer 2

hi

to find the atomic mass of an element you should know the number of protons as well as number of neutrons

because,

number of protons + number of neutrons = atomic mass


c = 6 + 6 = 12

therefore, atomic mass of carbon = 12
hope it helps....