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Nuclear Chemistry

QuestionAnswer
What does radioactive decay involve? changes in the nuclei of atoms
What is another name for unstable nuclei? Radioisotopes
How can unstable nuclei become more stable? by giving out alpha, beta or gamma radiation.
What are alpha particles? A helium nucleus which consist of two protons and two neutrons and carry a double positive charge
How far can alpha particles travel and what are they stopped by? a range of only a few centimetres in air and are stopped by a piece of paper
What is alpha attracted towards and why? attracted towards a negatively charged plate because they have a positive charge
What are beta particles High energy electron ejected from the nucleus of an atom.
How far are beta particles able to travel and what are they stopped by? able to travel over a metre in air but can be stopped by a thin sheet of aluminium
What are beta of particles attracted towards and why attracted towards a positively charged plate because they have a negative charge
What are gamma rays? electromagnetic waves of radiation emitted from within the nucleus of an atom
How far can gamma rays travel and what are they stopped by? able to travel great distances in air and they can be stopped by barriers made of materials such as lead or concrete
What type of charge do gamma radiation carry? Gamma radiation has no charge and therefore it is not deflected in the electrical field
What is half time? the time for half of the nuclei of a particular isotope to decay
What is the half-life of an isotope? a constant which is unaffected by chemical or physical conditions.
What can radioactive isotopes be used to date? Used to date minerals
What are some uses of radioactive isotopes They have a range of uses in medicine and industry
Created by: Ayesha.Saheel
 

 



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