Options:
A.
B.
C.
D.
Sign in to view the correct answer and detailed explanation.
Study with fewer interruptions on Android
Use Ulearngo on a verified device for smoother past-question study.
Ulearngo is an independent study app. It is not affiliated with, endorsed by, or representing Joint Admissions and Matriculation Board (JAMB). Always confirm official exam, admission, registration, syllabus, timetable, and result information from JAMB official website.
Earlier discussion
2 older comments kept for context.
Shemasane
Correct your mistake
Oluwaseun Adeyemi
Na, Mg, s and Ar one elements that belong to third period of the periodic table. Option A,B,C belong to the other period in the periodic table, second period