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Ch. 16 Flash Cards
Chapter Sixteen: Radioactive Decay
Question | Answer |
---|---|
What is an Alpha particle? | An Alpha particle is basically a Helium nucleus released after "Alpha Decay". |
What is Alpha Decay? | When an atom's nucleus is large and unstable, and must remove two protons and two neutrons (Helium nucleus) to become smaller, thus becoming more stable. |
What is a Beta particle? | A Beta particle is basically an electron, a negatively charged particle that is released after "Beta Decay". |
What is Beta Decay? | Beta Decay is when a neutron is turned into a proton, or a proton into a neutron. Either way, an electron is emitted afterwards. This electron, in this case, is called a "Beta Particle". |
What is Gamma Decay? | Gamma Decay is when an atom has a high energy level, and must emit a photon with high a amount of energy called a "Gamma Particle". This results in an atom with a lower energy level. |
What is a Gamma Particle? | A photon emitted after Gamma Decay to lower an atom's energy level. |
Briefly describe the process of radioactivity. | Radioactivity is the process by which a nucleus of an atom gives off nuclear radiation. |
What is a mass number? | The mass number of an atom's nucleus is the sum of the numbers of protons and neutrons in that nucleus. |
What are isotopes? | Isotopes are atoms with the same atoms of protons and electrons as normal atoms of that element do, but have a different number of neutrons, increasing it's atomic mass, causing it to weigh more than the normal atoms. |
What is a half-life, in terms of radioactive decay? | A half-life is the amount of time it takes for half of a substance to decay (this could take thousands of years, depending on the element). |
What is Nuclear Fission? | Nuclear Fission is the process by which a large nucleus splits into two smaller, more stable nuclei and energy is released. |
What are continuous series of nuclear fission reactions? | Those are nuclear chain reactions. Example: a neutron hits a uranium nucleus, which splits into Barium and Krypton nuclei, plus three other neutrons that hit other uranium nuclei, that split into more Barium and Krypton nuclei and more neutrons... |
What is the the process by which two or more nuclei that have small masses combine, to form one bigger nucleus; also releases energy? | That is called Nuclear Fusion. |