Question

Write the symbols for two carbon isotopes one with 5 Neutrons and the other one with 7 neutrons

Answer 1

`_(6)^(11)\text{C} \text{ and } _(6)^(13)\text{C}`

Explanation:

The general atomic symbol for an isotope is
`_(Z)^(A)\text{X}`

C has atomic number Z = 6, so it has six protons (p).

The mass number A =the number of protons plus neutrons = p + n

(1) Five neutrons

A = 6 + 5 = 11

The atomic symbol is
`_(6)^(11)\text{C}`.

(2) Seven neutrons

A = 6 + 7 = 13

The atomic symbol is
`_(6)^(13)\text{C}`.