Paper 2 · Periodic table position from electronic configuration; ionic bonding with fluorine
An element X has the electron configuration 2, 8, 3. In which period of the periodic table is X located?
APeriod 3
BPeriod 2
CPeriod 4
DGroup 3
Explanation: X has three electron shells (2,8,3), so it belongs to Period 3; the number of shells equals the period number.
Derived from ZIMSEC Chemistry 5071/2 Paper 2 Theory, November 2016, Q1
