Scientists believe the Earth's inner core to be solid. This is probably due to extremes in: pressure

depth

density

temperature

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b. atoms in metallic solids are not arranged in a regular pattern

explanation:

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.