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An unstable atom has excess internal energy, with the result that the nucleus can undergo a spontaneous change towards a more stable form. This is called 'radioactive decay'. Each element exists in the form of atoms with several different sized nuclei, called isotopes.
What is stable and unstable atom?
Atoms found in nature are either stable or unstable. 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.
What is an example of an unstable atom?
What is an example of an unstable atom? Unstable isotopes (which are thus radioactive) are called radioisotopes. Some elements, eg uranium, have no stable isotopes. When an atom of a radioisotope decays, it gives off some of its excess energy as radiation in the form of gamma rays or fast-moving sub-atomic particles.
What is the most unstable atom?
In April 2019 it was announced that the half-life of xenon-124 had been measured to 1.8 × 1022 years. This is the longest half-life directly measured for any unstable isotope; only the half-life of tellurium-128 is longer….Tables.
| Element | xenon |
|---|---|
| unstable in italics odd neutron number in pink | 132 Xe |
| 129 Xe | |
| 131 Xe | |
| 134 Xe |
Why are some atoms unstable?
Why some elements are radioactive (unstable). When the atoms of an element have extra neutrons or protons it creates extra energy in the nucleus and causes the atom to become unbalanced or unstable.
What makes a molecule unstable?
The stability of atoms depends on whether or not their outer-most shell is filled with electrons. If the outer shell is filled, the atom is stable. Atoms with unfilled outer shells are unstable, and will usually form chemical bonds with other atoms to achieve stability.
What is a stable atom?
A stable atom has a net charge of 0. In other words, it has an equal number of protons and electrons. The positive protons cancel out the negative electrons. When the number of electrons does not equal the number of protons, the atom is ionized.
Why are heavy atoms unstable?
large nuclei contains more number of protons.As a result the coloumb's force of repulsion between protons increases and becomes dominant over the short range attractive nuclear force between nucleons.As a result the unstability of large nuclei increases.
Why do atoms become unstable?
When the atoms of an element have extra neutrons or protons it creates extra energy in the nucleus and causes the atom to become unbalanced or unstable.
What is term to the stable atoms?
A stable atom is an atom that has enough binding energy to hold the nucleus together permanently. An unstable atom does not have enough binding energy to hold the nucleus together permanently and is called a radioactive atom.
