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Elements
Elements
O An element is made up of one type of atom
O An element is made up of one type of atom
O Pure substances
O Pure substances
O Can not be broken down
O Can not be broken down
O There are over 100 known natural elements.
O There are over 100 known natural elements.
O They’re organized in the Periodic Table of
Elements.
O They’re organized in the Periodic Table of
Elements.
O Each element has a special symbol of 1 or 2
letters called a Chemical Symbol
O Examples:
O - Oxygen
H - Hydrogen
Au - Gold
O Each element has a special symbol of 1 or 2
letters called a Chemical Symbol
O Examples:
O - Oxygen
H - Hydrogen
Au - Gold
Chemical Symbol
O The chemical symbol of an element tells the
number of protons, neutrons, and electrons the
element has.
Chemical Symbol
O The chemical symbol of an element tells the
number of protons, neutrons, and electrons the
element has.
O Number of Protons = Atomic Number
O Number of Electrons = Number of Protons = Atomic
Number
O Number of Neutrons = Mass Number - Atomic Number
O Number of Protons = Atomic Number
O Number of Electrons = Number of Protons = Atomic
Number
O Number of Neutrons = Mass Number - Atomic Number