You pack a bit of each into a capillary tube and put them both over the same flame. "B" melts last. Which is more likely to be ionic?*

Atomicity occurs to prevent updates of the database occurring only partially, which can cause greater problems than rejecting the whole series outright.some are monatomic, diatomic, triatomic etc because it shows the number of atoms. for example, monatomic means it contains only one atom.

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.