How many neutrons does an element have of its atomic number is 50 and its mass number is 156?

Ok so I think you would first subtract

156 - 50 = 106

Since atomic number is based on the number of protons, you should subtract the 50 from 156

106 should be your answer

Hope this helps!

heats surface water up

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.