Which is a characteristic of a lewis base? it behaves as the electron donor. it behaves as the electron acceptor. it donates a hydrogen ion to other compounds. it increases the concentration of hydrogen ions.

Definition of lewis base:

Example:

                                       H3N +  BF3  ⇒   H3N---≥BF3

Condition

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.