I. Structure of the Atom Chemical Symbols Subatomic Particles

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I. Structure of the Atom Chemical Symbols Subatomic Particles Atomic Structure I. Structure of the Atom Chemical Symbols Subatomic Particles

Metal that forms bright blue solid compounds. p.270 QUIZ ON Thursday 9/13 A. Chemical Symbols Capitals matter! Element symbols contain ONE capital letter followed by lowercase letter(s) if necessary. Metal that forms bright blue solid compounds. Co vs. CO Poisonous gas.

B. Subatomic Particles in a neutral atom Most of the atom’s mass. NUCLEUS ELECTRONS in a neutral atom PROTONS NEUTRONS NEGATIVE CHARGE POSITIVE CHARGE NEUTRAL CHARGE Most of the atom’s mass. Atomic Number equals the # of protons

C. Atomic Mass atomic mass unit (amu) 1 u = 1/12 the mass of a 12C atom 1 proton = 1 u 1 neutron = 1 u Mass of proton and neutron are basically the same. © Addison-Wesley Publishing Company, Inc.

The mass of an electron is so small that it is not counted in the Atomic Mass!

D. Atomic Number Number of protons only! Identifies the type of element If it has a different # of protons it is a different element. Atomic Number is on the Periodic Table. In a neutral atom protons=electrons

E. Mass Number Sum of the protons and neutrons in the nucleus of an atom. © Addison-Wesley Publishing Company, Inc. Always a whole number. Mass # = protons + neutrons

F. Isotopes Mass # Atomic # Atoms of the same element with different numbers of neutrons. Isotope symbol: Mass # Atomic # “Carbon-12”

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

C. Isotopes Average Atomic Mass reported on Periodic Table weighted average of all isotopes Avg. Atomic Mass

C. Isotopes EX: About 8 out of 10 chlorine atoms are chlorine-35. Two out of 10 are chlorine-37. Avg. Atomic Mass 35.4 u