Chemistry Chapter 1- Atomic Structure and the Periodic Table
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10 Terms
What is an element
A pure substance that is made up of one type of atom
What is a compound
A substance made from two or more elements that are chemically bonded together
What is a mixture
Two or more substances that are not chemically bonded together
Examples of separation techniques
Filtration
Distillation
Chromatography
Evaporation
What is an isotope
An atom of the same element with a different number of neutrons and protons
What is relative atomic mass
The average mass of an element's atoms compared to carbon-12
Why are noble gases not reactive
They have a complete outer shell so they have no need to lose, gain or share electrons
Why are alkali metals reactive
Alkali metals are reactive because they have one outer electron that's easily lost
Properties of halogens
Their melting/boiling points increase down the list
They are toxic in their elemental form
Their density increase down the list
Properties of transition metals
High density
High melting point
The ability to conduct electricity and heat
Note 
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