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. You are NOT required to watch this! 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.