When a metal element reacts with a non-metal element an ionic compound is formed. When a non-metal element reacts with a non-metal element a covalent bond is formed. Structures and properties ...

The slideshow shows a covalent bond being formed between a hydrogen atom and a chlorine atom, to form hydrogen chloride.

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Assays were performed in 50 mM HEPES, pH 8.0, containing Na 2 SO 4 to an ionic strength of 100 mM. Enzyme (100 nM final concentration) was incubated with varying concentrations of inhibitor for 10 min ...