How many have been killed?

Answer 1

Between the various wars and Intifadas, around 16,000 to 19,000 Arabs identifying as Palestinians have died either as a result of Israeli military action, Israeli civilian action, or from blowing themselves up in Suicide Bombings during the Intifadas.

The number decreases to 6,000-7,000 if the Palestinian Suicide Bombers in the Intifadas are removed from the calculation.

In terms of other countries that have also killed Palestinians.

Jordan: 10,000-20,000
Lebanon: 4,000-7,000
Syria: 500-1,000
Egypt: 500-1,000