Atoms & Isotopes NOTES. Reading the Periodic Table AEMAEM Atomic Number Average Atomic Mass Element Symbol.

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Presentation transcript:

Atoms & Isotopes NOTES

Reading the Periodic Table AEMAEM Atomic Number Average Atomic Mass Element Symbol

Reading Atoms & Isotopes E A M Element Name – M Element Symbol Mass Number Atomic Number Or

Atomic Number The number of Protons in the nucleus of a given atom Remember – All atoms as a whole want to have a Neutral electrical charge. Atomic #the # of Protons the # of electrons = =

Mass Number The sum of the number of protons and number of neutrons in the nucleus of an atom. Example: Carbon n 6 p + 12

Isotopes Atoms that have the same number of Protons but different numbers of Neutrons. Example: Bromine - 79 = 35p and 44n Bromine - 80 = 35p and 45n

Average Atomic Mass The average mass of all isotopes of an element. Example: In a sample of 100 Carbon atoms: 99 of them are Carbon-12 & 1 is a Carbon-14. What’s the Average Atomic Mass? 12.02

Finding the # of Neutrons: # of Neutrons = Mass # - Atomic # Use the formula below: 3 Li 6.94 Name:# p :# e :# n : Lithium 3 3 4

Unit of Measurement (MASS): Atomic Mass Unit (amu) one-twelfth the mass of a carbon-12 atom. (6P & 6N) 1 amu = x Kg 1p = amu 1n = amu 1e = amu

Practice Problems Element: _________ Symbol: _________ Protons: _________ Protons: ________ Electrons: _________ Electrons: ________ Neutrons: _________ Neutrons: ________ 50 Sn Tin Mg 12 Magnesium-24

More Practice Problems Element: _________ Protons: _________ Protons: ________ Electrons: _________ Electrons: ________ Neutrons: _________ Neutrons: ________ Cr Au Chromium Gold

More Practice Problems Element: _________ Protons: _________ Protons: ________ Electrons: _________ Electrons: ________ Neutrons: _________ Neutrons: ________ Cl Cl Chlorine Chlorine