Activity 1 Objective: Predict the probable location of electron/s in an atom (electron cloud, Heisenberg's Uncertainty Principle) WHERE DO NEGATIVES HIDE? (Adopted from the Science 9 Learner's Module) Materials: one short bond paper, pencil, compass, tape; and ruler Procedure: Draw a dot at the center of the bond paper. Draw 5 concentric circles around the dot making the radius of each circle as follow: 1cm; 3cm; 5cm; 7cm; and 9cm respectively. Lay it on the floor using tape so it won't move. 3. 4. Stand in front of the paper and hold a pencil at your chest level. 5. Drop the pencil repeatedly until you have 50 dots on the paper. 6. Complete the table below. 1. 2. Data Circle Distance Area from the Center (A) 1 2 3 4 5 (B) 1.0 2.0 3.0 4.0 5.0 (C) The Difference of Areas of two consecutive circles (D) 3.14 25.13 28.27 50.27 78.54 75.40 153.94 100.53 254.47 125.66 Figure 3 This is how your circles will look like. Number of Dots in Number of dots per each Circle cm² (E + D) (E) (F) Percentage of Probability of Finding the Dots (G) Let us think about these: 1. What do you observe with the number of dots in every circle as it moves away from the center? 2. To complete the table, let's do some math! To help you with this, let us assume that there are only 5 dots in Circle 1 as our example. No. of dots in Circle 1 = 5 (answer for E) No. of dots per square centimeter === = 0.1990 (answer for F) Percent Probability = (No. of dots per cm²) x 100 5 D 25.13 = 0.1990 x 100 = 19.90% (answer for G) Try it now using an extra paper. Write your answers in the table above. 3. How many dots are there in the area with the highest percentage of probability of finding the dots? 4. What do you think dots represent? 5. Do you think your results are similar to the distribution of electrons in an atom? Why did you say so?​