How are sodium (Na) and potassium (K) similar? O A. They are hard metals.
B. They are highly reactive.
C. They are soft nonmetals.
D. They rarely react.

Which process describes vaporization that takes place below the surface of a liquid? condensation melting boiling evaporation

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent

In the reaction h2co3 (aq) + 3nh3 (aq) = 2 nh4+ (aq) + co3 2-, how many electrons are transferred?