dars 1

• atom


  Simplest particle in any substance
• الترابيزة معمولة من wood of was absome!
• الحيطة من محمولة
• atena كثير لا حيطة
• Ahmad zlod Malikan
• Positive protons (+)


  Positive charge
• Hero (neutral): neutrons (zero)


  Neutral charge
• negative : elections (_)


  Negative charge
• Positive proton no change neutrons- negative
• Heavy protons, neutrons Light elections
• Sub atomic table


  • Position
  • nucleus
  • protons positive inside the
  • zero charge molens
  • neutrons
  • elections negative
  • atomic
  • mass
  • unit
• Atomi is ellectricaly neutral ?
• number of positive protons is equal to the number of negative elections
• Protons protons * elections atom
• اهم حاجة فى الـ Linger print
• Atomic number


  Number of protons inside the nucleus
• mass number


  Number of protons and neutrons inside the nucleus
• protons 29 neutrons: 64-29-35. elections 29
• Protons 3 neutrons 4 elections 3
• Protons 16 neutrons 16 elections: 16
• protons 17 endations 195 electrons 19
• protons 8 neutrons. 1 electrons &
• Electonic Structure


  Arrangement of electrons in an atom
• Electron shells


  • 1 shell. 2 (1) 2
  • 2" shell: 2(2) 2 8
  • 3 shell 2 (3)²=36
  • 4Shell: 2(4)² = 64
• 1 shell is 2 secol shell 8, 3" shelt 4thshed = 21625th 30e
• P=24 n=52-24=32
• P11 23 ell 28 1 P.3
• 1. 31 e-31
• 1. 35 C=3S
• P=13 Fo de 18
• Isotopes


  Same element, Same Proton number, different mass number
• Isotopes


  • Cobalt
  • Uranium
• Periodic table


  Arrangement of elements
• Periodic table


  • Arranged by increasing atomic number
  • Grouped by chemical properties
• number of protons increase كل ما ينزل period number of shells increase
• of elections in the outer shell
• Isotopes


  Same number of protons, Different physical properties
• Draw the electronic Structure

  of 28 S showing the cutershell elections
• Types of elements


  • metals
  • non metals
• Metals


  • Shiny
  • Good conductors