Answer:

The correct isotopic symbol for this atom can be determined by using the following format:

A

X

Z

where:

A = mass number (number of protons + number of neutrons)

X = chemical symbol for the element

Z = atomic number (number of protons)

Given that atom X contains 30 protons and 35 neutrons, its mass number A is:

A = number of protons + number of neutrons

A = 30 + 35

A = 65

The chemical symbol for the element is X.

The atomic number Z is equal to the number of protons, which is 30.

Therefore, the correct isotopic symbol for this atom is:

65

X

30

The answer is not one of the given options.