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Com 2 '7 az 112
 

Com 2 '7 az 112

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Definition of A, Z and isotopes

Definition of A, Z and isotopes

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  • The mass # is written as a left superscript. While the element’s at. # is written as a left subscript
  • The mass # is written as a left superscript. While the element’s at. # is written as a left subscript

Com 2 '7 az 112 Com 2 '7 az 112 Presentation Transcript

  •  
  • The periodic table is arranged in order of increasing atomic number
  • ATOMIC NUMBER Number of protons in an atom
  • ATOMIC NUMBER Z
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  •  
  • An individual atom is electrically neutral protons = electrons
  • How many protons and electrons are in an oxygen atom?
  •  
  • OXYGEN Z = 8
  • protons = 8 electrons = 8 OXYGEN Z = 8
  • URANIUM Z = 92 protons = 92 electrons = 92
  • MASS NUMBER A
  • Total number of protons and neutrons in an atom of a given isotope MASS NUMBER
  • Mass Number Mass number is the number of protons and neutrons in the nucleus of an isotope. 8 8 18 18 Arsenic 75 33 75 Phosphorus 15 31 16 Nuclide p + n 0 e - Mass # Oxygen - 10 - 33 42 - 31 15
  • CARBON's mass # A = 12
  • U's mass # A = 238
  • A x z Mass # At. #
  • Write the symbol for the atom that has an atomic number of 9 and a mass number of 19.
  • 19 F 9
  • How many electrons and how many neutrons does the atom have? 19 F 9
  • How many electrons and how many neutrons does the atom have? 19 F 9 number of neutrons = mass # - at. # A= 19 Z = 9 = 10 neutrons # of neutrons = A- Z # of neutrons = 19 - 9
  • 31 X 15 Identify the element
  • 173 X 70 Identify the element
  • CARBON 6 protons 6 neutrons
  • URANIUM 92 protons 146 neutrons
  • All atoms of the same element do not necessarily have the same number of neutrons in their nuclei
  • Atoms of the same element that have different number of neutrons ISOTOPES
  • Isotopes…Again (must be on the test) Isotopes are atoms of the same element having different masses due to varying numbers of neutrons . Isotope Protons Electrons Neutrons Nucleus Hydrogen–1 (protium) 1 1 0 Hydrogen-2 (deuterium) 1 1 1 Hydrogen-3 (tritium) 1 1 2
  • When an atom loses or gains an electron IONS
  • More protons than electrons positive charge + CATION                                          
  • More electrons than protons negative charge - ANION
  • 24 Mg 12 How many p+, e- and neutrons are present in the following atom or ion ?
  • 24 Mg 12 24 Mg 2+ 12 Mg atom – neutral 12 p+, 12 e- If it loses 2e- ??? What is it’s charge? # of p+ = +12 # of e- = -10 + 2 Magnesium cation
  • Write the chemical symbol for the ion with 9 protons and 10 electrons 19 F -1 9
  • 27 Al +3 # of neutrons = 27 - 13 = 14
  • Write the chemical symbol for the ion with 7 protons and 10 electrons 14 N -3 7
  • How many protons and electrons are present in the S -2 ion? 32 S -2 16
  • Initial Appearance of Each Metal Metal Reactivity Metal Initial Appearance             Metal Cu(NO3)2 Cu+2 Mg(NO3)2 Mg+2 Zn(NO3)Zn+2 AgNO3 Ag+ Cu         Mg         Zn