f68 224 f10 84f 799 7a8 e66 169 612 3a9 95e 466 bea 099 1dd a16 0a5 ef5 868 10f 93e bc1 325 2c1 3eb 5da 226 29a a5a ec7 246 f3f 706 af2 7b6 fe3 be1 ef5 79e 3b7 9d7 a90 751 720 0fa 6d5 d1c 558 bdd 8a4 843 93e d6d bca bed e8c c81 bce 616 312 ca5 122 45b 440 aaf dfc 303 faf 66c 461 5e2 6fe aa6 e21 2c5 8c5 7a6 888 754 a50 0cc 2eb eb6 af2 dda edd 650 4ed 5a9 efc 7e6 07c 43b 9aa dac b7f 964 555 436 460
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.
