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Any of the noble gases (in the right-most column of the Periodic Table): helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) radon (Rn), and Hydrogen.
They all have what is called a stable "octet."
See the Related Questions for more information on what the octet rule in chemistry is.
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What is radioactive in physics?
the unstable nucleus of an atom
What is the definition of a radioisotpoe?
A radioisotope is an atom that has an unstable nucleus characterized by excess energy.
In nuclear fission reactions what causes the atom's nucleus to become unstable?
the absorption of a free-moving neutron by the atom's nucleus
What is the most highly active atom in the nuclear atom system?
If you are looking for the most chemically reactive atom or element, it is fluorine. As regards which atom is the most active in its nucleus, there are a lot of very unstable radioactive atomic nuclei. Some are so unstable that they can only exist for a small fraction of a second, or, more properly, have an extremely short half-life.
What is an example of unstable equilibrium in sports?
unstable equilibriu is whenthe centre of gravity of a body lies above the point of suspension and supports.
What is an unstable atom?
An unstable atom is a radioactive atom.
What makes a atom unstable?
it might not be unstable with anything.......
What makes a copper atom unstable?
it might not be unstable with anything.......
What are the characteristics of a atom?
A radioactive atom is an atom of an element with an unstable nucleus.
Which would you most expect to be an unstable atom?
Any atom in the first family of the periodic table of elements is very unstable.
Is 288 is unstable or reactive atom?
no
Does an atom become imbalanced with a positive charge?
The stability of the positive ion depends on the atom which removes the electron. As an example, when a sodium atom becomes positive, it is highly stable, on the contrary, when a chlorine atom becomes positive, it is highly unstable.
What numbers are an unstable or reactive atom?
The numbers listed represent the first, second and third energy levels, respectively. On this basis, which of the following is an unstable or reactive atom? 2, 8, 1
What is the term for an atom that has an unstable nucleus?
radioisotope
What is another term for an atom that is unstable?
isotope
What is radioactive in physics?
the unstable nucleus of an atom
What is the term for an atom the decays?
unstable, radioactive
