Atomic number  and Atomic mass
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Atomic number and Atomic mass

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Atomic number  and Atomic mass Atomic number and Atomic mass Presentation Transcript

  • Chapter 2 Atoms and Elements The AtomAtomic Number and Mass Number Isotopes LecturePLUS Timberlake 1
  • Atomic TheoryAtoms are building blocks of elementsSimilar atoms in each elementAtoms from different elements combine to form different substances LecturePLUS Timberlake 2
  • Subatomic ParticlesParticle Symbol Charge Relative MassElectron e- 1- 0Proton p+ + 1Neutron n 0 1 LecturePLUS Timberlake 3
  • Location of Subatomic Particles electrons protons neutrons nucleus LecturePLUS Timberlake 4
  • Atomic NumberCounts the number of protons in an atom LecturePLUS Timberlake 5
  • Atomic Number on the Periodic TableAtomic Number 11Symbol Na LecturePLUS Timberlake 6
  • All atoms of an element have the same number of protons11 protons 11Sodium Na LecturePLUS Timberlake 7
  • Learning CheckState the number of protons for atoms of each ofthe following:A. Nitrogen1) 5 protons 2) 7 protons 3) 14 protonsB. Sulfur1) 32 protons 2) 16 protons 3) 6 protonsC. Barium1) 137 protons 2) 81 protons 3) 56 protons LecturePLUS Timberlake 8
  • SolutionState the number of protons for atoms of each of thefollowing:A. Nitrogen 2) 7 protonsB. Sulfur 2) 16 protonsC. Barium 3) 56 protons LecturePLUS Timberlake 9
  • Mass Number Counts the number ofprotons and neutrons in an atom LecturePLUS Timberlake 10
  • Atomic SymbolsShow the mass number and atomic numberGive the symbol of the element mass number 23 Na sodium-23 11 atomic number LecturePLUS Timberlake 11
  • Number of ElectronsAn atom is neutralThe net charge is zeroNumber of protons = Number of electronsAtomic number = Number of electrons AND the number of protons LecturePLUS Timberlake 12
  • Subatomic Particles in Some Atoms16 31 65 O P Zn8 15 308 p+ 15 p+ 30 p+8n 16 n 35 n8 e- 15 e- 30 e- LecturePLUS Timberlake 13
  • IsotopesAtoms with the same number of protons, but different numbers of neutrons.Atoms of the same element (same atomic number) with different mass numbers Isotopes of chlorine 35 Cl 37 Cl 17 17 chlorine - 35 chlorine - 37 LecturePLUS Timberlake 14
  • Learning Check Naturally occurring carbon consists of three isotopes, 12 C, 13C, and 14C. State the number of protons, neutrons, and electrons in each of these carbon atoms. 12 C 13 C 14 C 6 6 6#p _______ _______ _______#n _______ _______ _______#e _______ _______ _______ LecturePLUS Timberlake 15
  • Solution 12 C 13 C 14 C 6 6 6#p 6 6 6#n 6 7 8#e 6 6 6 LecturePLUS Timberlake 16
  • Learning CheckAn atom of zinc has a mass number of 65. A. Number of protons in the zinc atom 1) 30 2) 35 3) 65 B. Number of neutrons in the zinc atom 1) 30 2) 35 3) 65 C. What is the mass number of a zinc isotope with 37 neutrons? 1) 37 2) 65 3) 67 LecturePLUS Timberlake 17
  • SolutionAn atom of zinc has a mass number of 65. A. Number of protons in the zinc atom 1) 30 B. Number of neutrons in the zinc atom 2) 35 C. What is the mass number of a zinc isotope with 37 neutrons? 3) 67 LecturePLUS Timberlake 18
  • Atomic Mass on the Periodic TableAtomic Number 11 Symbol NaAtomic Mass 22.99 LecturePLUS Timberlake 19