Many of the unique properties of water are attributed to the fact that water:
contains hydrogen bonds.
requires heat to condense.
exists in three phases at the earth's surface.
is a universal solvent.
is a polar molecule.

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

the ratio of the conjugate base to the acid required to attain the desired ph.