# Chemistry Chapter 4 and 5

 Proportional or Inversely Proprtional Frequency/Wave Length Inversely proportional Proportional or Inversely Proprtional Wavelength/ Energy Inversely Proportional Proportional or Inversely Proprtional Frequency / energy Proportional Frequency  =  (symbol and Unit) u (1/sec;  Hz ) Wavelength =  (symbol and unit)  (m) the upside down y C =  (2answers) speed of light is wavelength times frequencyc = 3.00 x 108 m/s High frequency is _____ energy High Long wavelength is ___ energy Low Plancks Constant Energy of Light= h u(frequency) In Planck's constant: Energy of Light= h u(frequency)      h= h = 6.626 x10-34 J s What is Planck’s constant E = h u What model is this? The Bohr Model When electrons move between energy levels they_____ or ____ light. absorb or give off atomic spectra. when Electrons can move between     energy levels absorbing or     giving off light Emission spectra “atomic  finger prints” A problem with Bohr’s atom Electrons traveling in an orbit should give off light continuously  …  they don’t. What did De Broglie say about electrons They were waves containing specific amounts of energy Wave particle duality both sets of properties present – wave and particle properties Heisenberg Uncertainty Principle We can only observe electrons by interaction with photons. Interactions with photons cause electrons to move. What did Heisenberg say about how we can know where and atom is. Heisenberg says: we can’t know where an electron is AND where it is going at the same time. Orbital: Definition A three dimensional space around the nucleus where an electron is likely to be found. 90% probablility. Orbitals Quantum Numbers:   -Tells us.....   -The 4 numbers are... Tell us where electrons are LIKELY TO BE based on energy states of electrons1) energy level, 2) the sub level, 3) the orbital and 4) the spin. Energy Level or ______ _____ _______. What NUmbers “principle quantum number”n= 1,2,3,4,5,6,7 As n increases,  the energy and distance from nucleus _____. Increases 2) The Sub Level:    -Describe the ____    - What are they Describes the SHAPEThere are 4 shapes:  s, p, d, f 3) The Orbital Each orbital holds _ electrons. What is it? 2The orbital is the specific region of the sublevel the electron is in.  s has 1, p has 3, d has 5, f has 7 s orbitals are are spherical p orbitals are  dumbell shaped d orbitals are complex f orbitals are really complex 4) The Spin For each orbital there are two spins: up and down. n^2= total number of obitals in the Energy Level 2n^2= Number of Electrons in an Energy Level As ____ _____ goes up, orbitals get _____. Energy Levels, Bigger Electron Configuration: Arrangement of electrons in an atom. Aufbau principle: an electron occupies the lowest-energy orbital that it can. Hund’s Rule: orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron. Pauli exclusion principle: no two electrons in the same atom can have the same four quantum numbers Orbital Notation IRREGULARS 24         Cr     [Ar] 4s1 3d5 Crunium 29         Cu     [Ar] 4s1 3d10 Copper IRREGULARS24         Cr     [Ar] 4s1 3d5 crunium29         Cu     [Ar] 4s1 3d10 copper If an electron moves from a lower energy level to a higher energy level light is________. Absorbed If an electron moves from a higher energy level to a lower  energy level light is _______ Emitted Lyman series: UV light, goes to n=1 level Balmer series: visible light, goes to n=2 level Paschen series: Infrared light, goes to n=3 level Atomic #= # of ______and # of ______. protons and electrons atomic mass= (mass #* %)+ (mass #* %)/ 100 isotope same element but different nuetrons and different mass number mass # = num of protons + Nuetrons Forms of radiation for low to high energy Radio - High wavelength  low frequency and energyMicrowavesInfaredVisible- red (low energy) Orange Yellow Green Blue UltravioletXrays Gamma rays- High energy and frequency low wave length Stable electron configurations are likely to contain orbitals that are completely _______ or _________. full or empty Authorhwillson834538 ID179212 Card SetChemistry Chapter 4 and 5 DescriptionChemisty Updated2012-10-23T02:20:01Z Show Answers