PERODIC TABLE

PERODIC TABLE

This is a picture of the perodic table and when you click on it takes you to the webpage where I got the picture from.


TYPES OF CHEMICALS
Alkali Metals Aluminum Oxygen
Alikaline Earth Metals Carbon Halogens
Transition Metals Nitrogen Noble Gases


The periodic table was first invented by a man named Dimitri Mendeleev (1834-1907). He arranged the elements by there increasing atomic mass. He was seeing similar properties in the elements, so he put the elements most similar side by side and in columns. His periodic table has blanks in it because there were no know elements with the appropriate properties.
The second periodic table made was invented by a young British physicist named Henry Moseley (1887-1915). He figured discovered a nuclear charge and called it the atomic number. His periodic table was arranged by atomic number just as the periodic table today.
Todays periodic is arranged in seven horizontal rows called periods (arranged in increasing atomic number). The vertical rows are called groups or families and there are 18 groups. The types of elements in the groups are, starting from the left going to the right are Alkali Metals, Alkaline Earth Metals, Transition Metals, Aluminum, Carbon, Nitrogen, Oxygen, Halogens, Noble Gases. Elements with similar chemical properties are all in the same group, this is due to the "Periodic Law: when the elements are arranged in order of increasing atomic number, there is a periodic pattern in their physical and chemcial properties. There are now 110 elements in the perodic table."1

Main, Careers in Science, Perodic Table, MRHS Chemistry Faculty, Electron Configuration, The Atom,
Different Branches of Chemistry, Moles, Balancing Equations, Chemistry Definitions, Orbital Notation



1"Addison-Wesley Chemistry", Addison-Wesley Chemistry,SI Edition Copyright 1993 Addison-Wesley Chemistry Publisher Limited. Page. 273 and 276

Source: The text on my page was taken from the book, "Addison-Wesley Chemistry", Addison-Wesley Chemistry, SI Edition Copyright 1993 Addison-Wesley Chemistry Publisher Limited.