Chapter 18, Problem 8STP

To determine

The number of electrons present in an argon atom.

Answer to Problem 8STP

The correct option is (C).

Explanation of Solution

Group 18 elements of the periodic table are called noble gas or inert gas elements. All the elements of group 18 have 8 electrons in their valence shell and they are chemically inert.

Argon is present in the 18 groups and it is a noble gas. It has atomic number 18. Since the number of electrons is equal to the atomic number, therefore, the total number of electrons present in an argon atom is 18 also.

Thus, options (A), (B), and (D) are wrong, and Options (C) is correct.

Conclusion:

Hence, the number of electrons in the argon atom is 18.