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There is a simple difference between a nucleus and a nucleon. A nucleus is at the center of an atom, and it is that collection of particles, protons and neutrons, that make up the nucleus of that atom. Because atomic nuclei are composed of protons and neutrons, we have come up with the term nucleon to describe any particle that makes up an atomic nucleus. That means either a proton or a neutron, when we talk about them as part of the nucleus of an atom, can be properly called a nucleon. The nucleus of an atom is said to be made up of nucleons. It's just that simple.

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What are the characteristics of a atom?

A radioactive atom is an atom of an element with an unstable nucleus.


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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.


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The nucleus or atom left behind when a nucleus disintegrates or splits is?

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It is the nucleus of the atom that undergoes change during radioactive decay.


What is an atom which has unequal number of protons and neutrons in the nucleus?

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smaller than the original atom and possibly radioactive


What is a characteristic of a radioactive nucleus?

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When the nucleus of an atom changes by emiting particles what is this called?

radioactive decay


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What do you call a atom that decays?

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