PLEASE HELP! Which of the following is true about a calcium atom (Ca) and a gallium atom (Ga)?
A. A calcium atom is larger and has more electrons.
B. A calcium atom is smaller and has more electrons.
C. A calcium atom is smaller and has less electrons.
D. A calcium atom is larger and has less electrons.

An experiment was performed on a 2-kg block. forces of 5, 10 and 15 newtons respectively were applied to the block for 5 seconds. describe the difference in acceleration between the three trials. a) the final accelerations will all be the same. b) the final acceleration will triple between the first and third trial. c) the final acceleration will be cut by 1/3 from the first to third trial. d) the final acceleration will increase nine time between the first and third trial.