Quarter 2

I. Title: Designing Your Own Periodic Table II. Purpose: To design your own periodic table using information similar to that available to

Mendeleev: III. Materials: 1. Periodic table; 2. Index cards IV. Procedure: From p. 127

a. Write down info available for each element on separate index cards. Appropriate info includes:

a) Atomic mass b) States of matter c) Density d) Other readily observate properties

b. Do not write name of element on card but keep a separate key V. Data: Part A: Index cards and key

Part B: Initial attempt at organizing elements

1 2 13 14 15 16 17 18

1 L

2 B C D

3 M N O G E

4 I

5 A

6 H

7 F K J

Part C: Actual order of elements. Draw same table as above.

1 2 13 14 15 16 17 18

1 L

2 B C D

3 M N O G

4 E I A

5 H

6 F K

7 J

IV. Discussion: Answer discussion questions on p. 127

1. a. Because people back then were able to weigh substances but atomic number was established after the periodic table was made.

b. No

2. Eight groups, Seven Periods.

3. All missing elements in group 1 except the topmost element are soft and react with oxygen. All missing elements in group 2 are silvery, good heat conductors, and are ductile and malleable. All missing elements in group 13 are soft and have low melting points. The group 14 missing elements are not very similar but all tend to form covalent compounds. Group 15 missing elements are solid at room temp except Nitrogen and most exist in two or more allotropic forms. Missing group 16 elements exist in several allotropic forms and occur in compounds and in pure form. The group 17 elements are reactive non-metals. The rest of the group 18 elements are stable gasses.