Question

carbon has atomic number 6. it comprises thee isotopes, the first with 6 neutrons, the second with 7 neutrons, the third with 8 neutrons. calculate the mass

Answer 1

Answer:

13,14

Explanation:

Atomic mass of first isotope of carbon = atomic number + no. of neutrons = 6 + 7 = 13

Atomic mass of second isotope of carbon = atomic number + no. of neutrons = 6 + 8 = 14

Answer 2

Answer:

Atomic no.(Z) = 6

No.of proton =6

i)No. of neutron = 6

mass no(A) = no of proton + no of neutron

= 6+6= 12

ii) neuton = 7

mass no = 6+7= 13

iii) mass no = 6+8 = 14