13.1.1 Half Pyramid Write a program that fills half the canvas with circles in a diagonal formation. Have Tracy draw circles along the width of the canvas on the bottom row. Have the number of circles decrease by 1 on each iteration until there is only 1 circle on the top row. Follow these guidelines: - Use a radius value of 25 pixels for all circles - Create a variable called circle_amount that keeps track of how many circles should be in each row. Hint: The bottom row should start with 8 circles!

Scientists have changed the model of the atom as they have gathered new evidence. one of the atomic models is shown below. what experimental evidence led to the development of this atomic model from the one before it? a few of the positive particles aimed at a gold foil seemed to bounce back. the colors of light emitted from heated atoms had very specific energies. experiments with water vapor showed that elements combine in specific proportions. cathode rays were bent in the same way whenever a magnet was brought near them.