GK
NUCLEAR SCIENCE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
An element with stable atoms
|
|
|
An element with unstable nucleus atoms
|
|
|
An element with moving atoms
|
|
|
An element with closely arranged atoms
|
Detailed explanation-1: -An unstable nucleus exhibits radioactivity; i.e., it spontaneously disintegrates or by emitting particles and/or electromagnetic .
Detailed explanation-2: -An atom is stable if the forces among the particles that makeup the nucleus are balanced. An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom’s nucleus may result from an excess of either neutrons or protons.
Detailed explanation-3: -Radioactivity is property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. It is, in essence, an attribute of individual atomic nuclei.
Detailed explanation-4: -The unstable nucleus of radioactive atoms emit radiation. When this occurs, a new atom and element are formed. This process is called radioactive decay. It continues until the forces in the unstable nucleus are balanced.