Atoms on the Periodic       Table    December 17, 2012
Objectives1. Describe the present model of the   atom explaining electrons, neutrons,   and protons
Periodic TableAtoms make up all matterElements are any material that is made upof only one type of atomElements are organi...
Each element is designated an atomicsymbol on the periodic table
AtomsAtoms cannot beseen with visible lightRobert BrownFirst to discover directevidence of the atom
An Atom is made up of three parts:    Protons   Neutrons   Electrons
ElectronsElectrons surround the nucleus in anelectron cloudElectrons carry a negative chargeThe atom is mostly empty space
Electron Cloud Model
Why don’t we pass through one another?Electrical repulsion – two electrons withnegative charges will repel each other
ProtonsProtons and neutrons are bound to theatomic nucleusProtons carry a positive chargeProtons are identified by Atomic ...
NeutronsNeutron has no electrical charge, but thesame mass as a protonProtons and neutrons are called nucleonsMass given t...
Atomic Mass• Electrons are so small they are  considered negligible in mass• Atomic mass is measured in the unit –  amu  ...
Mass Number, Isotopes and         Ions     December 18, 2012
Electrons are so small they are considered negligible in mass Protons and neutrons in the nucleus• Atomic mass is measured...
Atomic MassAtomic mass on the periodic table –average of all its isotopesIsotope – an Element with differingnumber of neut...
Mass NumberMass number = total number of protonsand neutronsIdentify isotopes by the mass number
Agenda              Bell work                       • Finish yesterday’s WS• Finish notes• Practice Isotopes and • Disting...
Writing Isotopic SymbolsX = element symbolA = Mass NumberZ = Atomic NumberTotal number of neutrons:   Mass Number – Atomi...
Isotopic NotationHydrogen - 2, has one proton and oneneutronHydrogen - 3, has one proton and twoneutrons
IonsAtoms that gain or lose electronsLose electrons – positive in chargeGain electrons – negative in charge
Hydrogen that has lost an electron             H+1Hydrogen that has gained an electron             H-1
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Atoms and the periodic table

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Atoms and the periodic table

  1. 1. Atoms on the Periodic Table December 17, 2012
  2. 2. Objectives1. Describe the present model of the atom explaining electrons, neutrons, and protons
  3. 3. Periodic TableAtoms make up all matterElements are any material that is made upof only one type of atomElements are organized onto the periodictable
  4. 4. Each element is designated an atomicsymbol on the periodic table
  5. 5. AtomsAtoms cannot beseen with visible lightRobert BrownFirst to discover directevidence of the atom
  6. 6. An Atom is made up of three parts: Protons Neutrons Electrons
  7. 7. ElectronsElectrons surround the nucleus in anelectron cloudElectrons carry a negative chargeThe atom is mostly empty space
  8. 8. Electron Cloud Model
  9. 9. Why don’t we pass through one another?Electrical repulsion – two electrons withnegative charges will repel each other
  10. 10. ProtonsProtons and neutrons are bound to theatomic nucleusProtons carry a positive chargeProtons are identified by Atomic numberatom is electrically neutral: Number ofprotons = number of electrons;
  11. 11. NeutronsNeutron has no electrical charge, but thesame mass as a protonProtons and neutrons are called nucleonsMass given to each proton and neutron is 1
  12. 12. Atomic Mass• Electrons are so small they are considered negligible in mass• Atomic mass is measured in the unit – amu  Atomic Mass Unit Atomic mass on the periodic table
  13. 13. Mass Number, Isotopes and Ions December 18, 2012
  14. 14. Electrons are so small they are considered negligible in mass Protons and neutrons in the nucleus• Atomic mass is measured in the unit – amu  Atomic Mass Unit
  15. 15. Atomic MassAtomic mass on the periodic table –average of all its isotopesIsotope – an Element with differingnumber of neutrons
  16. 16. Mass NumberMass number = total number of protonsand neutronsIdentify isotopes by the mass number
  17. 17. Agenda Bell work • Finish yesterday’s WS• Finish notes• Practice Isotopes and • Distinguish between the Ions following: – Atomic Number – Mass Number• History of the Atom – Atomic Mass• Atoms Quiz tomorrow • Define an Isotope • What identifies what an element is?
  18. 18. Writing Isotopic SymbolsX = element symbolA = Mass NumberZ = Atomic NumberTotal number of neutrons: Mass Number – Atomic number = number of neutrons
  19. 19. Isotopic NotationHydrogen - 2, has one proton and oneneutronHydrogen - 3, has one proton and twoneutrons
  20. 20. IonsAtoms that gain or lose electronsLose electrons – positive in chargeGain electrons – negative in charge
  21. 21. Hydrogen that has lost an electron H+1Hydrogen that has gained an electron H-1
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