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