Atomic Structure, Periodic Table, Chemical Bonds, Chemical Formulas Worksheet Page 24
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2516B
Chemical Formulas
Investigation
Sample game after four turns:
CH
OH scores 18 points
3
Fe
O
scores 76 points
2
3
SiO
scores 30 points
2
H
SO
scores 50 points
2
4
Starting the game
Each player starts with ten randomly selected tiles. The
remaining tiles should be placed in a box or paper bag so
that additional tiles may be drawn without being seen. The
playing surface can be any flat table (or floor) with
minimum dimensions of 75-by-75 centimeters.
Each player draws a tile from the bag; the highest atomic
number goes first. Once the starting player has been
determined, those tiles are returned to the bag. The play
continues to the starting player’s right.
Play
1. Players take turns adding a compound to the crossword by using tiles from their set
of ten. Either side of a tile may be used.
2. The elements in a compound may be arranged in any order, as long as they are in a
single horizontal or vertical row.
3. Each new compound must be shown by the player to have oxidation numbers that
add up to zero. Otherwise the player must take back the compound and wait until the
next turn.
4. If the compound is correct, the player adds up the atomic numbers of all the atoms in
the compound to determine the points and then draws new tiles to restore a set of ten.
5. Play continues until all the tiles in the bag are used and one player is out of tiles, or
until all players are unable to make a compound with their remaining tiles.
6. The winner is the player with the highest score at the end of the game.
Determining correct compounds
The oxidation numbers found directly above each element on the periodic table provided are
used to determine whether a molecule is correct. The oxidation numbers of all the elements in
the compound must add up to zero. In some cases there is more than one oxidation number for
an element. Iron (Fe), for example, has oxidation numbers of +2 and +3. The player may choose
either oxidation number to add to the total.
The Special Bonds card included with the Periodic Table Tiles gives some additional
possibilities for forming compounds.
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