Periodic Table - Presentation

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THEPERIODICTABLE

all about the periodic table& why we use it

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Contents

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Section 3

User Intro

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Section 4

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Section 6

Periodic Table

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What is the periodic table?

the basics of the periodic table

The periodic table of elements is known all over the world, used to display elements and organise them according to their features. It is easy to use and gives information about all known elements such as their chemical symbol and atomic mass.

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THE BASICS

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how was the periodic table created?

John Newlands

The first person to arrange the known elements in a table. Ordered them by atomic mass.

John Newlands, a British chemist, was the first person to arrange the known elements into a periodic table. They were arranged with increasing order of atomic masses. By doing this, he noticed that elements with similar properties occurred at regular intervals, closely resemblimg those of the musical scale. His dicovery was therefore named the Law of Octaves.

In 1869, a Russian chemist called Dmitri Mendeleev created the framework that became the modern periodic table. He left gaps for elements that were yet to be discovered in his array of the elements, and even predicted the properties of some undiscovered ones. Both Newlands and Mendeleev thought in logical ways, but Mendeleev did some things differently and made it more useful than Newlands' table – for example, he swapped the order of some elements to fit their properties better.

Dmitri Mendeleev

Constructed on Newlands' idea and arranged elements more according to properties.

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The periodic table is split into three main categories: Metals, Metaloids and Non-Metals. This is useful for determining the properties of elements - all elements in one category have similar properties. Metals are solid at room temperature (apart from mercury), lustrous, malleable and good conductors of heat and electricity. Metalloids have intermediate properties between metals and no-metals, are solids at room temperature and are sometimes semi-conductors of heat and electricity. Some have metallic and non-metallic chracteristics. non-metals are gases and solids at room temperature (except bromine), have a variety of colours and appearances and are brittle. They are insulators, which means they are poor conductors of heat and electricty.

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Categories of the Periodic Table

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series of the periodic table

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How does it work?

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Periods

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THE FUTURE OF THE PERIODIC TABLE

While generally the periodic table has stood the test of time and should change very little in the future, alterations and addition will continue. The largest area of change in the periodic table will come from the creation of new manmade chemical elements. Most of the new manmade elements tend to be "superheavy" elements. Due to the large numbers of protons in these elements and the resulting large forces of repulsion, these elements can only exist for a fraction of a second.

how the periodic table will change in the future

The Periodic Table Of Elements

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