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Oxygen-18 is a naturally occuring, stable isotope and is commonly used is scientific studies as a tracer. Using the periodic table,
explain the difference between oxygen-18 and oxygen-16.
A)
Oxygen-18 contains 9 protons while oxygen-16 only contains 8 protons.
Oxygen-18 contains 10 protons while oxygen-16 only contains 8 protons,
Oxygen-18 contains 10 neutrons while oxygen-16 only contains 8
neutrons.
Oxygen-18 contains 8 electrons while oxygen-16 only contains 9
electrons.

Velocity is the speed of an object in a certain direction so you'd need to know speed and direction

Transfer of electrons. hope it !

An atom's smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to move. 

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero.