Chemistry
UTME / JAMB 2025
Atomic Structure Electron Configuration Atomic Number Mass Number and Isotopes
Atom with the electron configuration of 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\) belongs to
A
Group 3 and Period 2
B
Group 8 and Period 3
C
Group 2 and Period 3
D
Group 2 and Period 6
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
Magnesium (Mg) belongs to Group 2 (the Alkaline Earth metals) and Period 3 of the periodic table, meaning it has 2 valence electrons and three electron shells, placing it in the s-block.
Source: WAEC / JAMB / NECO Classroom Archive (Record #74220)