DIY Homeschooler

On March 6, 1869, Dmitri Ivanovich Mendeleyev presented the periodic table of elements to the world. The table demonstrated that the elements, which are the building blocks of the universe, could be placed in order of their atomic weights, whereupon they would fall into groups having only a few discrepancies between characteristics.

Table of Contents

• What Is the Periodic Table of Elements?
• The Atomic Number
• The Electron Count
• Helpful, If Not Perfect
• Suggestions

What Is the Periodic Table of Elements?

The periodic table of elements is a graphical representation of the periodic law. The periodic law dictates that elements sharing similar properties show up in groups, based upon their atomic number.

This was originally proposed by Mendeleyev. He felt confident enough in this law to assert in his presentation that the several missing elements needed to make his table work did exist, but hadn’t been discovered. Accordingly, he assigned their places and properties. 

To make his periodic law work out, Mendeleyev challenged several of the atomic weights, using his law to prove that they had been measured wrong. He was right in several cases.

It was discovered that the table was more periodic, shall we say, if the elements were arranged by atomic number, not atomic weight as Mendeleyev proposed. 

In today’s periodic table of elements, the order of the substances are based upon atomic number.

The Atomic Number

Dutch physicist Antonius van den Broekhe proposed the use of the atomic number in 1911. The number itself represents the proton count in the element.

Generally speaking, the higher the weight, the higher the atomic number. There are a few exceptions where the atomic weight does not correspond so nicely with the atomic number. For example, cobalt has an atomic number of 27 and an atomic weight of 58.9332, while nickel, the following element with an atomic number of 28, has an atomic weight of 58.7.

The Electron Count

The significance of the periodic law is that elements can be classified into groups with similar properties, such as metals, metalloids, and nonmetals. These groups can be even further divided into other groups, based upon various properties and characteristics. This is possible because the electron count of the atom defines its characteristics, and the electron count always equals the proton count.

Hence:

• The properties of an element can be judged merely from where it lies on the table.
• Where an element lies on the table is determined solely upon its atomic number.
• The atomic number represents how many protons are in an element.
• For an uncharged element, the atomic number also represents how many electrons are in the given element.
• The electron count is a huge factor in determining an element’s properties.
• Thus the periodic table is a powerful tool!

Helpful, If Not Perfect

Still, a few elements simply refuse to be reconciled with the periodic law. As with all classification systems, there are outliers.

An example is radon, which is classed as a nonmetal and more specifically as a noble gas, but has some characteristics that are closer to a metal.

Despite its limitations, the periodic table of elements remains highly useful — not just as an organizing system, but as a means to study the elements.

Suggestions

Have your students do one or more of the following:

• Print out a copy of the periodic table.
• Group elements by type (metallic, nonmetallic, metalloids) by coloring groups the same color.
• Identify the noble gases.
• Explain what makes radon unique.
• Memorize the first 10 elements of the chart.
• Which elements are liquid at room temperature?
• Which elements are gasses at room temperature?
• Find one element to learn more about. Write a description of characteristics, uses, and history. Where might it be found in use today?

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Further Investigation

Dmitry Ivanovich Mendeleyev
Professional biography from Michigan State.

Periodic Table and the Elements (archived)
Explains the periodic table, and looks at the 18 elements that make up most of  the matter in the universe. Click on “Next Stop on Site Tour” to continue through the tutorial.

Activities

Dynamic Periodic Table
Incredible website that allows you to learn about each element, its properties, how it is used, where you will find it, and different compounds that use it — all with a click!

WebElements
Another interactive site like the one above.

Periodic Videos
Excellent video series for each element in the chart from the University of Nottingham.

Element of the Day
Sheets for recording the particulars about each element — one a day. Great idea!  Use the two resources above to learn about each element. @ScienceSpot.net

Periodic Table Scavenger Hunt
Interactive that helps build familiarity with the table.

Elements Cards
Print back-to-back to make element cards. Great for making a hands-on periodic table!

Quick Six
Fast-paced card game where student use clues to become more familiar with the elements.

Printable Periodic Table
Editable spreadsheet format that can be modified; for example, delete element symbols, etc. for practice.

Periodic Table Unit Test
A Quia quiz with 50 questions for wrapping up.

Books

Mystery of the Periodic Table by Benjamin Wiker
Fun look at Chemistry from a Christian perspective.

Periodic Table of the Elements Placemat
We used these when our children were young (gems and minerals, U.S. Presidents, map of the United States, animal tracks, etc.). Not exactly a book, but a great way to become familiar with the Periodic Table!

Unit Studies & Lesson Plans

Periodic Table Curriculum
Wonderful resource from Ag in the Classroom for older students that offers great explanations of how the table (and chemistry) works while the activities are geared toward agricultural applications.

The Periodic Table
Excellent lesson plan that not only does a great job explaining the periodic table and has helpful activity sheets, but is also interesting for students!

Printables & Notebooking Pages

The Elements
Beautiful periodic table poster from NOVA.

The Periodic Table of the Elements, in Pictures
Great for notebook!

Periodic Table of the Elements
Another illustrated table from the Foundation for Education, Science and Technology.

The Periodic Table of Elements Notebooking Pages
Simple pages for copywork, narrations,  or wrapping up.

These units have been created specifically with do-it-yourself (DIY) homeschoolers in mind: those that don’t want a lot of hand-holding. If this doesn’t describe your need, you might prefer a few of these pre-planned units. For those brave souls who enjoy pulling things together themselves, there are many ways to use these resources!