Atomic Theory

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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

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Periodic TableAtomic number number of protons,
ultimate organizer of periodic tableMass number
sum of number of protons and neutronsIsotopes
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 isotopesFor an element, not
an ion, protons electrons
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Which of the following represents isotopes of the
same element? Which element?
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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

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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

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In your notebook, fill this in
Atom of Protons of Neutrons of Electrons Mass
10 11
Barium 82
21 24
15 16
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Arrangement of subatomic particles in atom
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Characteristics of the 3 basic subatomic particles