Science help!! ists bout isotpes!!?

Question

3 questins; when looking at the periodic table how do you know if an element has any isotopes? what is a half-life element and how does it relate to isotopes? how is radioactivity released in an isotope?? need help with these!!

Answer 1

Periodic tables don't usually show isotopes; the charts are aimed more at chemists than at physicists, and chemists don't ordinarily deal with isotopes. If an isotope is radioactive (e.g., carbon 14), it will decay such that after some certain time, there is only half of it left; that time is called the half life. After another half life, half of that is gone, so you are down to a quarter of the original. Radioactive isotopes decay by the following means:
- Alpha decay. The original nucleus pops an alpha particle -- a helium nucleus, thus reducing its atomic number by 2 and its mass by 4. Uranium decays this way.
- Beta decay. The nucleus pops an electron (or in some cases, a positron), increasing the atomic number by one (or decreasing it), with the mass remaining unchanged. Uranium 239, made in a nuclear reactor, decays to neptunium in this way; the neptunium decays to plutonium in the same way.
- Gamma radiation. The nucleus goes to a state of lower energy by throwing a high-energy photon. This may be associated with one of the particle decays shown above.
- Nuclear fission. Some heavy atoms will break into two pieces when struck by a neutron, and some really heavy atoms will fission by themselves. Neutrons are often released in the process.

If you need data on isotopes, a good source for this (and a lot of other information) is a book called the "Rubber Book", originally published by The Chemical Rubber Company -- which discovered that it was making more money printing books than selling rubber. The actual book is:

Answer 2

Strictly speaking looking only on the table does not tell you if there are isotope for one element.
But many modern periodic table on Internet can allow you to find this . You click on name of the element.Then you have access to a page which gives you the nuclear composition of the isotopes if they exist . For radioactive isotopes you can have the half life i. e. the time for a given number to decay to half and also the number of neutrons, the number of protons is the atomic number of the element

Answer 3

The modern periodic table doesn't contains the isotopes of an element.