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chemical combination

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  • During the chemical reaction, sodium loses ............. electron(s) and changes into ........... ion.
    one , positive
  • Elements can be classified according to their properties and electronic structure into ........... , ............. and ................
    metals , non-metals , noble gases
  • The atom which lost an electron or more during the chemical reaction is .............
    positive ion
  • The atom which gained an electron or more during the chemical reaction is .............
    negative ion
  • The outermost energy levels of ..................... contain 5 , 6 or 7 electrons.
    non-metals
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