Assertion: atom's shell | /r/HasProperty | outer
Facets:
Source sentences:
text: Atoms with high reactivity have outer shells that are imbalanced because of a low number of electrons (one or two) or a higher but not full number (six or seven).
text: In a covalent bond — which forms between non-metals — atoms combine by sharing electrons to achieve a lower energy state, usually, again, by filling up their outer shells.
text: Atoms will form double and triple bonds if every electron pair is shared, but some atoms still need more electrons to fill their outer shells.
text: Metal atoms lose electrons from their outer shell when they form ions:
text: A single oxygen atom contains six electrons in its outer shell, which can hold a total of eight electrons.