Atomic Structure Nucleus-protons and neutrons Proton: 1 unit atomic mass 1 unit positive charge Neutron: 1 unit atomic mass, Neutral(no charge) 。E| ectrons Electron little mass, 1 unit negative charge 。 Atom and|on Atom: protons = of electrons lon: Atom gains/loses electron(s)
Atomic Structure Nucleus – protons and neutrons Proton: 1 unit atomic mass,1 unit positive charge Neutron: 1 unit atomic mass, Neutral (no charge) Electrons Electron: little mass, 1 unit negative charge Atom and Ion Atom: # protons = # of electrons Ion: Atom gains/loses electron(s) 6
Bohr's model of atoms- Incorrect n=6 Atom absorbs Ato energy Bohrs assumptions for e- orbital in an atom X Electrons are circling around the nucleus Y Electrons only stay in specific orbitals, and need absorb or emit energy when transiting onto another orbital 7
Bohr’s Model of Atoms – Incorrect 7 Bohr’s assumptions for e- orbital in an atom: Χ Electrons are circling around the nucleus. Electrons only stay in specific orbitals, and need absorb or emit energy when transiting onto another orbital
Orbitals Energy States for Hydrogen -0.1 -0.2 03 -0.5-.50 Orbital Energy States For H-atom, the orbital energy: E,=-13.6eV, En=E/n 8
Orbitals & Energy States for Hydrogen 8 Orbital Energy States For H-atom, the orbital energy: E1 = –13.6 eV, En = E1 / n2
Periodic Table of elements 7 10111213 15 16 17 18 1 Symbo t007 Solid Metals 4002602 Hg Liquid 10 Lanthanoids Baryum Unknown Actinoids 13 Sign 4 Scandium 47 154 5 Rb: Sr Nb f M Pd Ag Sn Sb Molybdenum Cadman Antimony 6 CS B 57-71Hf 32 Fanum 84 Ra89-103Rf Uuo For elements with no stable isotopes the mass number of the isotope with the longest half-life is in parentheses DesignandInterfaceCopyright1997MichaeldAyah(michael@dayah.com).http://www.ptable.com/ 61 Ce Nd1 Pm a Sm 2 Eu翟Gd Tb 3 Dy Ho Er Tm Neodymium Ptable bkm21题
Find Atomic Mass from Periodic Table 9
a"real Periodic Table Harvard Universit and Chemical siology 哪 Dept of Chemistry Chemical Biology, Harvard University, USA 10
10 A “real” Periodic Table Dept of Chemistry & Chemical Biology, Harvard University, USA