Elements
There are roughly about 100 elements. An element is a substance that cant be split into anything simpler by chemical reactions. A molecule is the smallest part of a chemical compound and the smallest part of an element that can exist in nature. A mixture is where two or more substances have been mixed not joined toghether. A compound is a substance made from the atoms of two or more different elements joined toghether.
The difference between a physical and chemical change is that a physical change is tempary and a chemical change is permanent.
The periodic table is a chart to show the elements group, name and symbol
The metals are found from aluminum stairs down.
Newlands put all the elements that they knew of in 1864 down in lightest to heaviest. Once he did this he found a pattern. Which was every 7 the 1st elelment and the 7th element would have similar properties, but there was a problem with this and that was that it only worked for the first 20. Madaleev basically said that Newlands was wrong. So after that he used Newlands
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