Model of atom: The electrons don't really orbit the nucleus like our planets orbit the sun. See the picture on right for a little more accurate model
A. Atoms are the basic building blocks of ordinary matter.
B. Atoms can join together to form molecules, which in turn form most of the objects around you.
C. All atoms are made of protons and electrons. Almost all atoms also contain neutrons
1. Protons are positively charged (+) and large
2. Electrons are negatively charged (-) and much smaller than protons
3. Neutrons are large and have no charge
4. Protons and neutrons are in the nucleus, while electrons surround the nucleus
Learning about atoms
This website talks about atoms and you can take a quiz afterward: http://www.chem4kids.com/files/atom_intro.html
What is an element?
D. What is an element?
1. An element is a substance that is made entirely from one type of atom
2. An element is defined by the number of protons in its nucleus
a. Each element has an 'atomic number', which is the number of protons in the nucleus
i. Hydrogen (H) has one proton, it's atomic number is 1
ii. Ununoctium (Uuo) has 118 protons
iii. Calcium has 20 protons
E. Periodic Table of Elements
1. The Periodic Table of Elements shows all of the elements known to man.
2. There are 90 naturally occurring kinds of elements. Scientists have been able to make about 25 more.
Hunting the Elements
PBS aired a special on the elements. It runs for 2 hours and is excellent to watch. We are only briefly covering atoms and elements as an introduction to the movement of electrons, however, you might enjoy watching it. Click on the photo to go to the webpage where you may watch this video. If you don't have Unity downloaded, you can click here to go the PBS website.