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Extension Exercises

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Extension Exercises

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1. Name: LiF
2. Write the chemical formula of Potassium Oxide

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Task 2
Allocated time: 5 min

Students from group A and group B will be asked to share their findings with their group mates then results will be shared with the teacher through padlet.

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Task 1
Allocated time: 7 min
Group A (student 1 and 2) will use Resource # 1 to find the rule for writing the binary ionic formula when the chemical name of an ionic compound is given
Group B (Student 3 and 4) will use resource # 2 to find the rule of writing the chemical name when the ionic formula is given.

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For student 3 and 4

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If an ionic compound contains a transition metal, use Roman numerals to denote which ion it is.

A transition metal is a metal that can use the inner shell before using the outer shell to bond. These are the elements in the middle of the periodic table - things like zinc, iron and copper. Naming polyatomic ionic compounds that have transition metals in them is also fairly easy. It follows the same naming rules as the simple binary compounds, but with an extra rule added in. So, you still name the cation first, followed by the anion with the suffix -ide added to the end of it.

The new rule is that transition metals form more than one ion, so this has to be accounted for in the naming. We do this by using Roman numerals to denote which ion it is. The Roman numeral will equal the charge on the ion. For instance, Fe2+ is iron (II). Fe3+ is iron (III).

When compounds are formed with these metals, the different ions still have to be accounted for. If I told you the compound was iron chloride, that wouldn't give you the full story. You wouldn't know if it was iron (II) or iron (III), which means you don't know how many chlorine atoms are in the compound to bond with the iron, since two chlorines would be needed for iron (II) and three for iron (III). If I instead told you that the compound was iron (II) chloride, you would know that it was Fe2+ in there, which means you have two chlorine atoms bonding with it. The formula would be FeCl2. If I said it was iron (III) chloride, the formula would be FeCl3.

Naming Polyatomic Ionic Compounds

A polyatomic ionic compound is a compound made up of a polyatomic ion, which is two or more atoms bonded together, and a metal. Naming polyatomic ions is harder, but doable. First, name the cation, which is just the name of the element. Next, name the anion. This gets trickier.

Let's first talk about a polyatomic ionic compound that contains oxygen. If the polyatomic anion contains oxygen, it is called an oxyanion. If it can form more than one form of oxyanion, it gets a suffix of either -ate or -ite. There are some common oxyanions that most people memorize.

Oxyanion | Number of forms
ClO | 4
NO | 2
SO | 2

If an oxyanion can form only two different kinds of oxyanions, the name of the ion with the greater number of atoms ends in -ate and the smaller number of atoms ends in -ite.

For example:

NO2 - is nitrite, with the ending -ite

NO3 - is nitrate, with the ending -ate

SO3 2- is sulfite, with the ending -ite

SO4 2- is sulfate, with the ending -ate

If the ion forms four different kinds of oxyanions, then they get a prefix along with their suffix. The first and lowest size ion gets hypo- as its prefix. The largest size ion gets per- as its prefix.

These look like this.

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Naming Ionic Compounds: Simple Binary, Transition Metal & Polyatomic Ion Compounds - Video & Lesson Transcript | Study.com

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An important part of dealing with chemical compounds is knowing how to refer to them. Learn how to name all ionic compounds, including simple...

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Resource # 1
For Student 1 and 2