1. Atomic Theory All matter consists of atoms
All the atoms of one element are identical in mass & other properties & are different from atoms of any other element
Atoms of one element cannot be converted into atoms of another element
Compounds are the chemical combination of two or more chemicals in a specific ratio

2. Periodic Table Atomic number: number of protons, ultimate organizer of periodic table Mass number: sum of number of protons and neutrons Isotopes: Number of protons & # of electrons in a given element are always the same but neutrons may vary Atoms of same element with different # of neutrons are called isotopes For an element, not an ion, #protons = #electrons

5. Which of the following represents isotopes of the same element
Which of the following represents isotopes of the same element? Which element?

6. Periodic Table
Columns are called groups, elements within groups share similar chemical reactivities & properties
Rows are called periods
Elements with A after them (on top) are called main group elements
Elements with B after them (on top) are called transition elements

7. Periodic Properties Demo
Play demo
All these metals display similar properties, i.e. react with H2O to form H2 + metalOH
React in an increasingly vigorous manner
Reaction:
Metal + H2O  Metal Hydroxide + H2
Lithium Reaction:
Write the reaction for Na or K

8. In your notebook, fill this in
Atom
# of Protons
# of Neutrons
# of Electrons
Mass # 10 11
Barium 82 21 24 15 16

9. Arrangement of subatomic particles in atom

10. Characteristics of the 3 basic subatomic particles