Huh? Every element can potentially be radioactive.
Here is a list of all of the naturally occurring (above trace levels) radioactive elements:
Yes, but only if it is radioactive. Radioactive elements change into different elements through radioactive decay.
Radioactive
There are different types of elements in the world including the dangerous radioactive ones. Two of the radioactive elements in the world are hydrogen and carbon.
No. Only radioactive elements, which undergo radioactive decay can change to different elements.
Unstable elements that decay or break down into different elements are called radioactive elements. These elements have an unstable atomic nucleus that undergoes radioactive decay, transforming into a different element and releasing energy in the process. Examples of radioactive elements include uranium, radium, and plutonium.
The difference is that technetium is radioactive.
Examples: metals or nonmetals, radioactive or not radioactive, classification after the state of matter, reactive or not reactive etc.
No, trace elements are not necessarily radioactive. A link to a list of elements that have no natural radioactive isotopes is at a related question, below.
Radioactive elements make up a small fraction of all naturally occurring elements in Earth's crust. Most elements are stable and non-radioactive. However, even though they are a minority, radioactive elements play important roles in various scientific, medical, and industrial applications.
When an element "decays", it forms a different element. This is the definition of "decay" when referring to radioactive elements.
After disintegration all radioactive elements are transformed in other elements.
Not all of the transition elements are radioactive. Many of them are, and some of them have common radioactive isotopes, but some of them have no naturally occurring radioactive isotopes. Please note that all elements have synthetic radioactive isotopes, at least.