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Parts of the Atom Notes Parts of the Atom: 2 parts: Nucleus and electron cloud ________ Contains: Contains: Protons and __________ Neutrons __________ 1 amu with relative mass _________ 1 amu _________ and relative charge + _________ NONE!!! _________ “amu” stands for atomic _________ mass _________ Electrons ______________ 0______________ (too small to have mass) _ ______________ unit _______ Relationships between Particles 1. Atomic number is the # of ___________________ protons 2. Mass number is the # of ________ protons + ________ neutrons What is the atomic mass of this atom?? 12 3. 4. Chemical reactivity is determined by the electrons ___________________ Atoms are neutral when ___________________ protons = electrons What happens when atoms gain or lose electrons? They become (+ ) or (-) charged. Called: Called: Atomic # ____________ __________ Called: Atomic mass __________ To calculate # of neutrons: atomic mass – atomic # _______________________________ Atomic number = # of protons # of protons determines which ________________ element it is!! Who is element # 15? P (Phosphorous) How many protons does lithium have? 3 protons What is the atomic number of tin? 50 Symbol for Generic “X” Element: Mass #, A ______________ Atomic #, Z ______________ X P+N ( # ____________ ) P ( # ____________ ) Periodic Table: 24.305 24 12 Mg Magnesium Mg 12
