I. Atomic Structure II. Masses of Atoms Mass Number Isotopes Ion

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I. Atomic Structure II. Masses of Atoms Mass Number Isotopes Ion Ch. 3 - Atomic Structure I. Atomic Structure II. Masses of Atoms Mass Number Isotopes Ion

H Atomic Structure 1 1.00784 Proton = p+ Electron = e- Neutron = n0 Atomic # is the number at the top of each block on the periodic table Atomic # = #p Neutral Atom #p = #e- 1 H 1.00784

A. Mass Number always a whole number NOT on the Periodic Table! mass # = protons + neutrons always a whole number NOT on the Periodic Table! © Addison-Wesley Publishing Company, Inc.

Mass # Atomic # Element Notation Hyphen notation: carbon-12 Hyphen Notation: element name – mass # Nuclear Symbol: Mass #atomic #symbol Hyphen notation: carbon-12 Nuclear symbol: Mass # Atomic #

Isotopes Atoms of the same element with different mass numbers. Carbon – 12 Carbon – 14 © Addison-Wesley Publishing Company, Inc.

Ion – add up number of protons (+) and electrons (-) Ion is a neutral atom that gains or loses e- Loses e- (More protons) = (+) charge Gains e- (More electrons) = (-) charge

B. Isotopes © Addison-Wesley Publishing Company, Inc.

B. Isotopes Chlorine-37 17 37 20 atomic #: mass #: # of protons: # of electrons: # of neutrons: