Radio Active!
It is a radioactive element.
The minimum amount of unstable atoms needed to produce an uncontrolled chain reaction is called?
Hazardous, unstable, unlivable, etc.
This is a radioactive isotope.
It isn't really an ELEMENT that is unstable, but an ISOTOPE. That means that in general, for the same element, some atoms will decay, and some will not - the difference being the number of neutrons in the nucleus.
No, it's called "radioactive." "Retroactive" is something that's active in regards to the past.
Dissonance
radioactive decay
These isotopes are unstable and emit radiation.
This phenomenon is called radioactive disintegration.
Harmonies that sound tense and unstable in their arrangement are called dissonances. Dissonances create a sense of tension that typically resolves to consonant harmonies for a more stable and resolved sound.
A combination of tones that is considered unstable and tense is called a dissonance. Dissonance occurs when two or more tones clash and create a sense of tension or unresolved quality in music.