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The Periodic Table

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Nicole Hesson

on 6 February 2011

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Transcript of The Periodic Table

The Periodic Table of the Elements In 1869 Dmitri Mendeleev published his periodic table. He listed the elements in order of their atomic weight and started a new column when the characteristics of the elements began to repeat. The table has undergone some changes as new elements have been discovered, but it has basically remained unchanged since Mendeleev's publication. A group is a vertical column. A period is a horizontal row. Groups are considered the most important method of classifying the elements. In some groups, elements have similar properties and are given names to represent these trends.
alkali metals
alkaline earth metals
noble gases
metalloids Usually, groups are used, but in some regions of the periodic table, period trends tend to be more similar.

This is especially true to the transition metals and the "f-block" (containing the lanthanides and actinides). Periodic Table Trends Periodic Table Vocab An element is a substance that cannot be separated any further.
118 have been discovered
92 occur naturally
The other 26 are man-made Elements in the same group usually have similar characteristics. They also have the same number of bonding (or valence) electrons. History Antoine Lavoisier published a list of 33 elements in 1789. He grouped the elements into 4 general groups. Scientists spent the next century searching for more elements and a better classification scheme. Julius Lothar Meyer published a table of 49 elements based on valency (how elements tended to bond with other elements) in the year 1864. Meyer published a second table a year after Mendeleev did. Mendeleev's table was more successful for 2 reasons:
1. It was the first table to leave gaps when it seemed like the corresponding element had not yet been discovered. Unlike other scientists, he went a step further and predicted the properties of the missing elements. And 2. He occasionally ignored the order of the atomic weights and switched adjacent elements to better classify them into chemical families. Reading the Periodic Table Each box in the periodic table contains the same information. Elements in the same period do not have similiar properties. However, as you move across a period from left to right, the following trends exist.
The first element in a period is usually an active solid, while the last is an inactive gas
the size of the atomic radius decreases (atoms get smaller)
atomic mass increases
the ionization energy increases (it gets harder to remove electrons)
electronegativity increases (atoms are more likely to form bonds) You are probably already familiar with some of the elements on the periodic table. Silver and gold Gold Lead Neon Today we're going to learn
the history of the periodic table
basic periodic table vocabulary
periodic table trends
how to read the periodic table Some fun videos about the elements. Extra credit to anyone who can learn (and then sing) the lyrics to either (or both) of these songs.
Full transcript