Question

Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct?

They both have seven protons in the nucleus.
They both have the same mass number.
They both have seven neutrons in the nucleus.
They both have the same atomic number.

Answer 1

D. They both have the same atomic number.

Step-by-step explanation:

Isotopes have the same number of protons, therefore the same atomic number.

Answer 2

The last statement is correct

They both have seven protons in the nucleus.

it's wrong because they have six protons in the nuclear

They both have the same mass number.

it's wrong because Carbon-12 has mass number 12 but Carbon-13 has mass number 13

They both have seven neutrons in the nucleus.

it's wrong because Carbon-12 has six in the nucleus but Carbon-13 has seven in the nucleus

They both have the same atomic number.

It's true. They have the atomic number - 6