# What is a polyatomic ion Khan Academy?

## What is a polyatomic ion Khan Academy?

In this article, we will discuss polyatomic ions. The prefix poly- means many, so a polyatomic ion is an ion that contains more than one atom. This differentiates polyatomic ions from monatomic ions, which contain only one atom.

## What is Lewis structure of ions?

When the Lewis structure of an ion is written, the entire structure is placed in brackets, and the charge is written as a superscript on the upper right, outside of the brackets. For example, consider the ammonium ion, NH4+, which contains 9 (5 from N and 1 from each of the four H atoms) –1 = 8 electrons.

What does the Lewis structure for the polyatomic ion NO2 contains?

The NO2 Lewis structure has a total of 17 valence electrons. It’s not common to have an odd number of valence electrons in a Lewis structure. Because of this we’ll try to get as close to an octet as we can on the central Nitrogen (N) atom. This will mean that it will only have 7 valence electrons.

What are polyatomic ions give two examples?

The prefix poly- means “many,” in Greek, but even ions of two atoms are commonly referred to as polyatomic. Examples: Carbonate (CO32-), sulphate (SO42-), nitrate – NO3- and hydroxide ions OH- are all polyatomic ions.

### How many polyatomic ions are there?

Polyatomic Formulas – Polyatomic ions are made from more that one atom. This group of atoms act together as one unit with a single charge. Each of the polyatomic ions have a unique name….

The 9 polyatomic ions to know and write on your notecard:
Name Charge Formula
Phosphate 3- PO43-
Hydronium 1+ H3O+
Ammonium 1+ NH4+

### Which are polyatomic ions?

Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.