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1.All transition metals and rare earth metals act as positives in ionic bonding.

2.?

3.Substances with covalent bonds often form molecules with low melting and boiling points, such as hydrogen and water. The slideshow shows a covalent bond being formed between a hydrogen atom and a chlorine atom, to form hydrogen chloride. 1. A hydrogen atom with one electron and a chlorine atom with 17 electrons

Explanation:

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i just got this problem. it's 90.3