Masses of Atoms.

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Presentation transcript:

Masses of Atoms

The mass of the protons and neutrons (electrons have almost NO mass) Atomic Mass The mass of the protons and neutrons (electrons have almost NO mass) Atomic mass = mass #

# of protons in an atom Atomic Number The atomic # is the identity of an element Like a fingerprint for a human being

*If you need to find the number of neutrons in an atom: # neutrons= mass # - atomic #

Isotopes Atoms of the same element that have different numbers of neutrons Boron-10 ; Boron-11 Different isotopes have different properties

Average Atomic Mass Weighted average of an element’s isotopes

Practice Isotope name atomic # mass # # of protons # of neutrons # of electrons Potassium-37 Oxygen-17 uranium-235 uranium-238 boron-10 boron-11