* Atomic number refers to the number of protons in an atom's nucleus. It defines the element the atom belongs to. For example, all carbon atoms have an atomic number of 6 because they have 6 protons.
* Radioactivity refers to the spontaneous emission of particles or energy from the nucleus of an atom. This happens because some isotopes (atoms of the same element with different numbers of neutrons) have unstable nuclei that decay to become more stable.
Here's why the statement is wrong:
1. Atomic number itself is not radioactive. The atomic number only tells you the number of protons, not the number of neutrons. It's the *combination* of protons and neutrons in the nucleus that determines whether an atom is radioactive or not.
2. Radioactive isotopes exist for many elements with different atomic numbers. For example, carbon-14 (radioactive) and carbon-12 (stable) both have an atomic number of 6.
3. Not all atoms with high atomic numbers are radioactive. While elements with high atomic numbers tend to have more unstable isotopes, some have stable isotopes as well.
To summarize:
* Atomic numbers define elements.
* Radioactivity is a property of unstable isotopes, not the atomic number itself.
It's important to distinguish between these concepts to understand the nature of atoms and how they behave.
