Question

1. the electron dot diagram for a neutral atom of chlorine (atomic number 17) is shown below. which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons? :cl: o ³⁵cl¹⁻ o ³⁵cl²⁻ o ³⁵cl¹⁺ o ³⁵cl

Explanation:

Step1: Understand chlorine atom's electron - gain behavior

A neutral chlorine atom (atomic number 17) has 7 valence electrons. It gains 1 electron to achieve a stable octet (8 - valence - electron) configuration. When it gains an electron, it forms a negatively - charged ion.

Step2: Analyze the ion notation

The symbol for a chlorine ion with a stable octet is \(Cl^-\). The mass number of chlorine can be 35 or 37. But the charge is what indicates the stable ion form. A chlorine ion with a stable arrangement of eight valence electrons is \(^{35}Cl^{1 -}\) (the mass number 35 is just one of the common isotopes of chlorine).

Answer:

\(^{35}Cl^{1 -}\)