Element Notes (from 11/10/16)
Define Element
Simplest pure substance,
Cannot be broken down more
More than 100, Each one is unique
What is a chemical symbol?
A short way of representing an element
Always 1 capital letter or 1 capital & 1 lowercase
Examples:
Carbon = C
Gold = Au
Neon = Ne
Describe
how are elements organized
The Periodic Table of the Elements!
Arranged by atomic number and similar properties
Define Atom
Basic particle that makes up elements
Made of protons, neutrons, & electrons
Define Molecule
A group of 2 more atoms held together by a chemical bond
May be 2 of the same type of atom!
Example: O2
Define Compound
Substance formed by the reaction of 2 or more elements
Examples: Water = H2O
Table Salt = NaCl
Consider the following:
All compounds are molecules but not all molecules are
compounds.
Summary:
Everything is made of elements which are arranged in the Periodic Table. The atom is the particle that
makes an element. When at least two atoms bond together it makes a molecule. Which atoms from at
least 2 different elements bond together it makes a compound.