CHEMISTRY

JAMB 2007 - Question 32

Chemistry 2007 JAMB Past Questions - Question 32: The elements that belong to the third period of the periodic table are

Choose the correct answers from the options given.
The elements that belong to the third period of the periodic table are
A:
B:
C:
D:
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Correct Answer

D

Explanation

 
* **Li, Be, Al, and P:** This set only includes 4 elements and misses several key elements from the third period like Na, Mg, S, Cl, and Ar.
* **Na, P, O, and Cl:** This set includes Na and Cl from the third period, but it has O which belongs to the second period and excludes Mg, Al, Si, and Ar from the third period.
* **B, C, N, and O:** This set only includes elements from the second period and completely misses all elements from the third period.
* **Na, Mg, S, and Ar:** This is the **correct** set. All these elements belong to the third period and cover it completely.

Therefore, only the last option, **Na, Mg, S, and Ar**, correctly identifies the elements belonging to the third period of the periodic table.