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Intro. to the Periodic Table

Intro to the Periodic Table -- info taken from Grade 6 content

Susan Enders

on 20 June 2013

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Transcript of Intro. to the Periodic Table

Matter is anything that has mass and takes up space

Do not have to be able to see matter
You cannot see the air you breathe, but it is matter
Air has a very small mass, but you can see that it takes up space when you blow up a balloon.

Atoms are tiny particles that make up matter

So small you need a special kind of microscope called an electron microscope to see atoms.

Structure of atoms and how they join together determine the properties of matter

About 115 known different kinds of atoms that make up all matter.
Substances that have only one kind of matter (made of only on kind of atom) are called elements
They cannot be broken down into simpler substances by normal chemical or physical means
Elements in different combinations make up the tissues in your body, your book, pencil, flowers, minerals and all other matter.
Minerals make up rocks and the earth’s crust. Minerals are usually a combination of elements, but those minerals that are made up of ONLY ONE element like silver and copper are called native elements.

Elements are organized into a table called the Periodic Table of Elements which was originally developed by Dmitri Mendeleev in 1869 to order the elements by atomic number (number of protons)

The table shows symbols which are 1 or 2 letters
Notice the nomenclature: Hf vs. HF
Number above the symbol is the atomic number which is the number of protons.
Number below the symbol is the atomic mass which is the weighted average of all the isotopes
the colors of the elements tell a little about their characteristics

Periodic Table song by Tom Lehrer!
Full transcript