Trending

What is radioactivity in nuclear chemistry?

What is radioactivity in nuclear chemistry?

Radioactivity is the phenomenon of the spontaneous disintegration of unstable atomic nuclei to atomic nuclei to form more energetically stable atomic nuclei. Radioactive decay is a highly exoergic, statistically random, first-order process that occurs with a small amount of mass being converted to energy.

What is the name of the particle with the symbol 0 − 1e?

Beta particles
Beta particles (0−1β − 1 0 β , also represented by the symbol 0−1e − 1 0 e ) are high-energy electrons, and gamma rays are photons of very high-energy electromagnetic radiation.

How do you explain radioactivity?

Radioactivity is the term used to describe the natural process by which some atoms spontaneously disintegrate, emitting both particles and energy as they transform into different, more stable atoms. This process, also called radioactive decay, occurs because unstable isotopes tend to transform into a more stable state.

What is radioactivity in chemistry simple words?

As its name implies, radioactivity is the act of emitting radiation spontaneously. This is done by an atomic nucleus that, for some reason, is unstable; it “wants” to give up some energy in order to shift to a more stable configuration.

How is radioactivity used in chemistry?

3.4 Uses of Radioactive Isotopes Radioactive isotopes have the same chemical properties as stable isotopes of the same element, but they emit radiation, which can be detected. If we replace one (or more) atom(s) with radioisotope(s) in a compound, we can track them by monitoring their radioactive emissions.

What is radioactivity give the unit of radioactivity?

The SI unit of radioactivity is becquerel (Bq) and this term is named after Henri Becquerel. Unit of radioactivity is defined as: The activity of a quantity of radioactive material where one decay takes place per second.

Which statement best explains why mass is not conserved in a nuclear change?( 1 point?

Mass in nuclear reactions is not strictly conserved due to this principle of mass and energy being quite similar. We know that nuclear reactions release a lot of energy. This energy, though, is actually mass that is lost from nucleons, converted into energy, and lost as the mass defect.

How does the nucleus change in beta plus decay?( 1 point?

Beta decay changes the atomic number of the nucleus by increasing the number of protons, by decreasing the number of neutrons while leaving the atomic mass essentially the same.

What is radioactivity measured in?

becquerels
A material’s radioactivity is measured in becquerels (Bq, international unit) and curies (Ci, U.S. unit). Because a curie is a large unit, radioactivity results are usually shown in picocuries (pCi). A picocurie is one trillionth of a curie. The higher the number, the more radiation released by the material.

What is a radioactive element?

Radioactive elements are made up of atoms whose nuclei are unstable and give off atomic radiation as part of a process of attaining stability. The emission of radiation transforms radioactive atoms into another chemical element, which may be stable or may be radioactive such that it undergoes further decay.

What is an example of radioactivity?

For example, uranium and thorium are two radioactive elements found naturally in the Earth’s crust. Over billions of years, these two elements slowly change form and produce decay products such as radium and radon.