Test Index

JAMB Chemistry 2015 Paper

Question : 38

Total: 64

The elements that belong to the third period of periodic table are

Solution:

Concept:

The third period of the periodic table contains elements with electrons filled up to the third shell.

Explanation:

The third period elements are

\mathrm{Na}, \mathrm{Mg}, \mathrm{Al}, \mathrm{Si}, \mathrm{P}, \mathrm{S}, \mathrm{Cl}, \mathrm{Ar}

Option D gives

\mathrm{Na}, \mathrm{Mg}, \mathrm{S}, \mathrm{Ar}

, and all of these belong to the third period.

Options A, B, and C each include elements from other periods, such as

\mathrm{Li}

\mathrm{Be}

\mathrm{O}

\mathrm{B}

\mathrm{C}

, and

\mathrm{N}

, which belong to the second period.

Answer:

\mathrm{Na}, \mathrm{Mg}, \mathrm{S}

and

\mathrm{Ar}

Go to Question:

Prev Question

Next Question