Question

select all of the choices that are the same for two different isotopes of the same element.
number of protons
number of neutrons
atomic mass
atomic symbol
atomic number

Explanation:

• Number of protons: Isotopes are defined as atoms of the same element. The number of protons defines an element. So, for isotopes of the same element, the number of protons is the same.
• Atomic symbol: Since isotopes are of the same element, they have the same atomic symbol (e.g., \(H\) for hydrogen isotopes \(^1H\), \(^2H\)).
• Atomic number: Atomic number is equal to the number of protons. As isotopes of the same element have the same number of protons, they have the same atomic number.
• Number of neutrons: Isotopes differ in the number of neutrons. For example, in hydrogen isotopes \(^1H\) (1 proton, 0 neutrons) and \(^2H\) (1 proton, 1 neutron), the neutron number is different.
• Atomic mass: Atomic mass is the sum of protons and neutrons. Since the number of neutrons differs in isotopes, the atomic mass (protons + neutrons) also differs.

Answer:

• number of protons
• atomic symbol
• atomic number