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By Thomas C. Hsu

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What does this number tell you about the the atom? b. What is the number(s) above the element symbol called? What does this number tell you about the atom? c. Why do some elements have more than one number above the symbol? What are the variations in this number called? 25 C The Atomic Challenge Atomic Challenge is a game that simulates the periodic table of elements. The winner of the game is the first player to use all their marbles. 1. Each player should start with the following marbles: 6 blue marbles (neutrons), 5 red marbles (protons), and 5 yellow marbles (electrons).

What four elements make up almost all of the mass in your body? b. How many stable isotopes does oxygen have? c. Find one element on the chart that has no stable isotopes. d. What element has atoms with 26 protons in the nucleus? e. On most periodic tables a single atomic mass is listed instead of the mass numbers for all the stable isotopes. How is this mass related to the different isotopes? 26 Investigation 6A The Atom 27 6B Isotopes and Radioactivity Are all atoms of the same element exactly alike or are there differences?

Bases (or alkalis) are solutions that have a pH greater than 7. A pH of 7 is called a neutral solution. pH is important because most living things can only survive in a narrow range of pH. For example, if the pH of the water in an aquarium becomes too low (acidic) or too high (alkali) the fish in the aquarium cannot survive. As you work, you will find the pH of several common solutions you probably encounter all the time. You will also learn some of the properties of acids and bases. A Materials • • • • Spot plates Pipettes Red cabbage juice Red and blue litmus paper • 11 solutions (Table 1) Make a pH scale using indicators Safety Tip: Wear goggles and a lab apron as you work.

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