---
title: "A student analyzing a groundwater sample detects sulfide ions, \\(\\text{S}^{2-}\\). The atomic number of sulfur is \\(16\\). Which choice gives the ground-state electron configuration of \\(\\text{S}^{2-}\\) and the noble gas with which the ion is isoelectronic?"
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/119961/"
date_modified: "2026-08-21T08:31:09+00:00"
---

# A student analyzing a groundwater sample detects sulfide ions, \(\text{S}^{2-}\). The atomic number of sulfur is \(16\). Which choice gives the ground-state electron configuration of \(\text{S}^{2-}\) and the noble gas with which the ion is isoelectronic?

A student analyzing a groundwater sample detects sulfide ions, \(\text{S}^{2-}\). The atomic number of sulfur is \(16\). Which choice gives the ground-state electron configuration of \(\text{S}^{2-}\) and the noble gas with which the ion is isoelectronic?

- **A.** \(1s^2\,2s^2\,2p^6\,3s^2\,3p^6\); \(\text{Ar}\)
- **B.** \(1s^2\,2s^2\,2p^6\,3s^2\,3p^4\); \(\text{Ar}\)
- **C.** \(1s^2\,2s^2\,2p^6\,3s^2\,3p^6\); \(\text{Ne}\)
- **D.** \(1s^2\,2s^2\,2p^6\); \(\text{Ne}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119961/*