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Those elements which don't very stable nucleus tend to be radioactive.
Some isotopes of elements are radioactive in nature like Tritium(an isotope of hydrogen) and isotopes of cobalt are radioactive.
Apart from the isotopes, many heavier elements(most of the trans-uranium elements) are radioactive in nature.
An element having unstable nuclei(generally after being formed by alpha or beta decay) tends to attain a stable nucleus by gamma decay and emits radiation in the process.
All of the alpha, beta and gamma decay give out harmful radiations with gamma rays being most dangerous due to their highest penetrating power.
What else can I help you with?
Are synthetic elements radioactive?
Some synthetic elements are naturally radioactive due to their unstable atomic structures. For example, elements beyond uranium on the periodic table are typically artificially produced and tend to be radioactive. These elements can emit radiation as they undergo radioactive decay.
What elements that emit atomic particles are called?
Elements that emit atomic particles are typically referred to as radioactive elements. These elements undergo radioactive decay and emit particles such as alpha particles, beta particles, or gamma rays as they try to become more stable.
What is true of all elements after 83?
All elements after 83 on the periodic table are radioactive and have unstable nuclei. They typically undergo radioactive decay to reach a more stable configuration. These elements are known as the actinides and transactinides.
Are radioactive substances the last period of elements (at the bottom of the chart)?
Radioactive substances are not exclusive to the last period of elements on the periodic table, but many of the heaviest elements, particularly those in the actinide and transactinide series, are radioactive. These elements, found at the bottom of the periodic table, typically have unstable nuclei that decay over time. However, there are also radioactive isotopes of lighter elements scattered throughout the periodic table. Thus, while many radioactive elements are at the bottom, not all radioactive substances belong to this category.
Radioactive elements comprise a majority?
Radioactive elements make up a small fraction of all naturally occurring elements in Earth's crust. Most elements are stable and non-radioactive. However, even though they are a minority, radioactive elements play important roles in various scientific, medical, and industrial applications.
Do trace elements have to be radioactive?
No, trace elements are not necessarily radioactive. A link to a list of elements that have no natural radioactive isotopes is at a related question, below.
What is radioactive ore?
Minerals like uraninite and carnotite are highly radioactive ores of uranium.
What made up all radioactive elements?
After disintegration all radioactive elements are transformed in other elements.
Are all transition elements are radioactive?
Not all of the transition elements are radioactive. Many of them are, and some of them have common radioactive isotopes, but some of them have no naturally occurring radioactive isotopes. Please note that all elements have synthetic radioactive isotopes, at least.
The pressure and heat that produces magma are caused in part by?
Radioactive elements
What families have no radioactive elements?
Radioactive elements exist in all groups of the periodic table.
What are elements with no stable isotopes called?
Elements with no stable isotopes are called radioactive elements. These elements spontaneously undergo radioactive decay, which leads to the formation of stable isotopes over time.
