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Question:

Aluminium oxide,ammonia,calcium oxide,ethane,hydrogen bromide,iron sulfide, rubidium chloride,silicon diozide?

Which of these are electrons transferred or shared? Please help me, thank you

Answer:

Ionic bonds (transfer of electrons): Aluminium oxide, Calcium oxide, Iron sulfide, Rubidium Chloride (Basically anything that has a metal and a nonmetal - see reference tables online to know what are the metals and what are the nonmetals) Covalent bonds (sharing of electrons): Ammonia, Ethane, Hydrogen bromide, Silicon dioxide (It happens when two or more nonmetals and semi-metals group together in chemical bonds; Hint: prefixes helpEx: di-, tri-, eth-, meth-, but-).

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