Correct each of the following misstatements from Dalton’s atomic theory.

b. All atoms of a given element are very similar.

Identify the following:

c. the halogen in the fourth period

A given compound always contains the same proportion (by mass) of the elements. This principle became known as $________$.

Differentiate between an atomic element and a molecular element. Provide an example and a microscopic drawing of each.

Chlorine has two prominent isotopes, $^{37}\text{Cl}$ and $^{35}\text{Cl}$. Which is more abundant? How do you know?

The “Chemistry in Focus” segment No Laughing Matter ends with the statement “Clean may not necessarily be ‘green.’” Read this segment and explain the statement.

Identify the following:

b. the transition metal that has 25 electrons as a 2+ ion

Identify the following:

a. the heaviest noble gas

Imagine you are talking about chemistry to your friend who has not taken any science courses. Explain to him in your own words the five main points of Dalton’s atomic theory.

Several chemical elements have English names beginning with the letters B, N, P, or S. For each letter, list the English names for two elements whose names begin with that letter, and give the symbols for the elements you choose (the symbols do not necessarily need to begin with the same letters).

Compare Dalton’s atom with Thomson’s atom and Rutherford’s atom.

Hundreds of years ago, alchemists tried to turn lead into gold. Is this possible? If not, why not? If yes, how would you do it?

For each of the following chemical symbols, give the name of the corresponding element. a. K b. Ge c. P d. C e. N f. Na g. Ne h. I

Use the periodic table to find the symbol or name for each of the following elements.

Symbol ${\ \ \ \ }$ Name

Si ${\ \ \ \ \ \ \ \ \ \ \ }$ __________

______ ${\ \ \ \ \ \ \ \ }$ nickel

Ag ${\ \ \ \ \ \ \ \ \ \ \ }$ __________

______ ${\ \ \ \ \ \ \ \ }$ potassium

Ca ${\ \ \ \ \ \ \ \ \ \ \ }$ __________