What isotopes always have the same element?

Answer 1

Isotopes are variations of an element. Isotopes of one element always have the same number of protons because it's the number of protons that define the element. Isotopes of an element have the same number of electrons which will equal the number of protons. (That ignores atoms that are in the form of ions.)

Different isotopes of the same element have different numbers of neutrons. The variations in the number of neutrons make the mass of atoms different but they do not change the element nor do they change the chemical properties of the element.

Some isotopes of an element can be radio-active, that is, they are unstable and can emit an alpha or beta particle or a gamma ray. As an example, carbon has 6 protons and most atoms have 6 neutrons. A few carbon atoms have 8 neutrons with a mass of 14. It is known as "Carbon 14" and is radio active. That is because the nucleus can emit a beta particle and in doing so, the atom actually changes to a nitrogen atom.

Answer 2

I am not sure what your question is but isotopes have one less, or one more neutron than protons in an atoms which can change it's mass and many chemical properties.

Answer 3

All isotopes have the same element
Atomic Mass number

Answer 4

The isotopes of a chemical element have the same number of protons and electrons.

Answer 5

Isotopes of an element always have the same number of protons, which defines the element. They differ in the number of neutrons they possess, leading to variations in atomic mass.