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The elememts are made up of indivisible and inalterable particles of matter calles atoms.The atoms of the same element are te same between if
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Cathode rays are formed by particles with very low masses and negative electric charges,called electrons,which are present in all atoms
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The atom consists of a very small part,called nucleus posotively charged and containing almost all of the mass.Around the nucleus,in the cortex,electrons move . The átomos electrically neutral.
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The electrons are in electronic layers,rotating in well-defined and stable circular orbits.In these orbits,the electron does not absorb or emit energy, but it can jump from one orbit to another
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The spontaneus emission of radiation by some substances that are radioactive is called radioactivity. They are three types of radioactivity:alpha,beta and gamma
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With the ideas accumulated o ver the years,the scientist proposed the mechano-quantum model,valid today
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