A Periodic Table Logic Problem
Purpose: In this activity you will use a set of clues to identify a set of unknown
elements in a periodic table. The elements are the elements with atomic numbers
1-20 and 31-36. A letter of the alphabet is used to represent each unknown
element. The letter designation is not related to an element’s chemical symbol.
Each clue refers to a property of an element or a relationship an element has to
other elements in the periodic table. Along with logic and knowledge of
properties, you will use the periodic trends to solve the puzzle.
Grade: Neatness and completeness count.
Procedure: Use the following trend clues to place the elements in their proper
places on the provided periodic table. Try to identify the elements with direct
clues first. For example, B is a direct clue because it identifies only one element.
Group 1 Group 2 Group 13 Group 14 Group 15 Group 16 Group 17 Group 18
A – Has one of the highest electronegativities on the table.
B – Has one electron in a 3p orbital.
C – Has five electrons in the 4th energy level.
D – Forms the smallest 2+ ion.
E – Tends to gain one electron.
F – Electron configuration is 1s2 2s2 2p6 3s2 3p3
G – The most electronegative element.
H – An ion of this element with a 2+ charge has 18 electrons.
I – Its second ionization energy is large compared to its first ionization energy.