CAIE A-Level Chemistry 9.3.2 Deducing Unknown Element Identity
Practise combining physical and chemical evidence to locate an unknown element in the Periodic Table and identify it.
- Syllabus
- 2028–2030
- Course
- Chemistry 9701
- Level
- AS
Exam points
- use common ion charge and formula evidence to narrow the unknown element to a group
- use period-sensitive evidence such as ionic radius or shell count to narrow its possible row
- cross-check numerical and reaction evidence against neighbouring elements before naming the identity
9.3.2—The nature, possible position in the Periodic question 1
[Maximum number: 1]
X, Y and Z are elements all found within Groups 13, 14 and 15 of the Periodic Table.
X is in the same group in the Periodic Table as Y .
Y and Z are in Period 3.
The first ionisation energy of X is greater than the first ionisation energy of Y.
The melting point of Z is less than the melting point of Y.
Y and Z both form chlorides which are white solids. These white solids react with water to produce solutions with a pH of less than 4.
Which row of the table shows the possible identities of X and Y ?
X
Y
B
Al
Ge
Si
As
P
N
P
A
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