The electron arrangement for argon, which has 18 electrons, is
A) 2 in the inner electron shell, 8 in the second electron shell, and 8 in the outer electron shell.
B) 8 in the inner electron shell, 8 in the second electron shell, and 2 in the outer electron shell.
C) 6 in the inner electron shell, 6 in the second electron shell, and 6 in the outer electron shell.
D) 5 in the inner electron shell, 6 in the second electron shell, and 7 in the outer electron shell.
E) 7 in the inner electron shell, 6 in the second electron shell, and 5 in the outer electron shell.

Question

Quizplus · Accepted Answer

The electron configuration for argon (Ar), which has 18 electrons, follows the pattern of filling electron shells: 2 electrons in the first (innermost) shell, 8 in the second shell, and 8 in the third (outer) shell, matching option A. This arrangement adheres to the rules of electron distribution in shells, where the first shell can hold up to 2 electrons, and the second and third shells can each hold up to 8 electrons, reflecting the stable, noble gas configuration of argon.

The Electron Arrangement for Argon, Which Has 18 Electrons, Is