## DataLAB: How do atoms differ?

Each element is made up of atoms with a certain number of particles. The periodic table tells you how many protons and electrons are in atoms of each type.

**Data Collection**

- On your sheet from class, there are two copies of the first 18 elements of the periodic table. In the first copy, write the atomic symbol for each element in the center of its square. Use the periodic table to find the atomic symbol.
- Write the mass number (rounded to the nearest whole number) at the top right corner.
- Write the number of neutrons (number of neutrons = mass number - number of protons) in the bottom right corner.
- In the second table, draw a diagram of each element
*similar*to the one for lithium shown below.Write the number of protons and neutrons inside a circle to show the nucleus. Put the correct number of electrons for each element in rings in 1, 2, or 3 rings outside the nucleus.

## Average Speed Lab

9-11-18: Complete the table that was started in class, including calculating the Average Speed.

In ANALYSIS, answer this question: Compare the average speed of the ball in each trial. Are the results accurate and reproducible? Explain.

In ANALYSIS, answer this question: Compare the average speed of the ball in each trial. Are the results accurate and reproducible? Explain.