What element has an atomic weight of 145?
Promethium
| Hydrogen | ||
|---|---|---|
| Lithium | Beryllium | Carbon |
| Sodium | Magnesium | Silicon |
| Potassium | Calcium | Germanium |
| Rubidium | Strontium | Tin |
What are the 3 most radioactive elements?
A good example of this is tritium, a radioactive isotope of hydrogen naturally present at extremely low levels. This table contains the elements that have no stable isotopes….Radioactive Elements.
| Element | Most Stable Isotope | Half-life of Most Stable Isotope |
|---|---|---|
| Radium | Ra-226 | 1600 years |
| Actinium | Ac-227 | 21.77 years |
| Thorium | Th-229 | 7.54 x 104 years |
What are the examples of radioactive elements?
The following radioactive elements are found naturally in the environment.
- Alpha Radiation. Alpha radiation is a type of energy released when certain radioactive elements decay or break down.
- Uranium. Uranium is a radioactive element that can be found in soil, air, water, rocks, plants and food.
- Radium.
- Radon.
- Polonium.
Who was promethium discovered by?
Jacob A. Marinsky
Charles D. CoryellLawrence E. Glendenin
Promethium/Discoverers
Are Bananas are radioactive?
Bananas have naturally high-levels of potassium and a small fraction of all potassium is radioactive. Each banana can emit . 01 millirem (0.1 microsieverts) of radiation. This is a very small amount of radiation.
Which is an example of a radioactive element?
A good example of this is tritium, a radioactive isotope of hydrogen naturally present at extremely low levels. This table contains the elements that have no stable isotopes. Each element is followed by the most stable known isotope and its half-life. Note increasing atomic number doesn’t necessarily make an atom more unstable.
Who is the author of the list of radioactive elements?
Todd Helmenstine is a science writer and illustrator who has taught physics and math at the college level. He holds bachelor’s degrees in both physics and mathematics. This is a list or table of elements that are radioactive.
What is the half life of a radioactive element?
Half-Life of a Radioactive Element Half-life is the amount of time required, for half quantity of radioactive element to decay. For example C14has a half life of 5730 years. That is, if you take 1 gm of C14, then half of it will have been decayed in 5730 years.
When do radioactive elements have more than one decay mode?
A radioactive element may have more than one decay mode. When two nuclei have the same atomic number, but different atomic weight or mass numbers, then they are said to be isotopes. Isotopes have the same chemical properties but different physical properties.