Three of the compounds have ionic bonds (difference in electronegativity is greater or equal to 2,...

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Question

Three of the compounds have ionic bonds (difference in electronegativity is greater or equal to 2,...

Three of the compounds have ionic bonds (difference in electronegativity is greater or equal to 2,
or between 2 and 1.6 if it is metal + non-metal). Which?

AlBr3

SeS2

HgCl2

CaCl2

PbCl2

NaBr

Li2O

SiO2

I thought it was CaCl2, NaBr, PbCl2 and Li2O from what I managed to learn online. But thats four not three, what am I doing wrong?

science chemistry

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