discovered the electron. In Thomson’s "Plum Pudding Model" each atom was a sphere filled with a positively charged fluid. The fluid was called the "pudding." Scattered in this fluid were electrons known as the "plums." The radius of the model was 10-10 meters. Thomson suggested that the positive fluid held the negative charges‚ the electrons‚ in the atom because of electrical forces. Thomson’s “Plum Pudding Model is used in science‚ because it was the first model utilising electrons. He and his fellow
Free Atom Electron Electric charge
SLG Practice Final Exam Chem. 113 True and False 1. The Bohr Theory explains that an emission spectral line is due to an electron losing energy and changing orbitals. 2. 4s orbitals have higher energy than 3d orbitals. 3. An atom with an even number of electrons is always diamagnetic. 4. Covalent bonds are formed by atoms sharing electrons. Multiple Choice 5. Choose the INCORRECT statement about NH2-: a) There is one lone pair on N. b) There are two σ bonds. c) There are no π
Premium Electron Atom Chemical bond
10 Chapter 9: Chemical Bonding I – Lewis Theory 1. Which of the following statements is TRUE? a) A covalent bond is formed through the transfer of electrons from one atom to another. b) A pair of electrons involved in a covalent bond are sometimes referred to as "lone pairs." c) It is not possible for two atoms to share more than two electrons. e) A covalent bond has a lower potential energy than the two separate atoms. d) Single bonds are shorter than double bonds. 2. Which of the following
Free Chemical bond Covalent bond Electron
Shapes‚ Valance Bond Theory‚ and Molecular Orbital Theory 1) Determine the electron geometry (eg) and molecular geometry(mg) of BCl3. A) eg=trigonal planar‚ mg=trigonal planar B) eg=tetrahedral‚ mg=trigonal planar C) eg=tetrahedral‚ mg=trigonal pyramidal D) eg=trigonal planar‚ mg=bent E) eg=trigonal bipyramidal‚ mg= trigonal bipyramidal Answer: A 2) Determine the electron geometry (eg)‚ molecular geometry (mg)‚ and polarity of SO2. A) eg=tetrahedral
Premium Chemical bond Covalent bond Molecule
METALS Lose electrons and form positive cations. NON-METALS gain electrons and form negative anions. IONS Are charges particles. EXMAPLES Atomic Notation and Bohr Diagrams Lewis Dot Diagram Examples Lewis Dot Diagrams of an Negative ION (NON-METAL) Negative ions have 8 valence electrons! Lewis Dot Diagram of an Ionic Compound Lewis Dot Diagrams of an Positive ION (METAL) Positive Ions have no valence electrons! The Octet Rule REMEMBER! All elements want
Premium Ion Chemical bond Atom
CH 202 Breakdown UV/Vis: Molecules containing π-electrons or non-bonding electrons (n-electrons) can absorb the energy in the form of ultraviolet or visible light to excite these electrons to higher anti-bonding molecular orbitals. The more easily excited the electrons (i.e. lower energy gap between the HOMO and the LUMO)‚ the longer the wavelength of light it can absorb. Conjugation raises the energy of the bonding orbitals and lowers the energy of the antibonding molecular orbital. This
Premium Molecule Mass spectrometry Atom
water takes to reach its destination. This can be applied in the variables of resistance. The electrons ’bounce ’ off the atoms - this causes the electrons to head elsewhere rather than the desired direction. In a long tube there are more atoms‚ this slows the electrons down as they ’bounce ’ off into another direction. In a short tube‚ there are less atoms which means there are less to deflect the electron any more speeding the speed up. In theory‚ the length should be proportional to the resistance
Premium Orders of magnitude Electric current Electrical resistance
General Features of Oxidative Additions Oxidative addition reactions usually involve a coordinatively unsaturated 16-electron metal complex or five-coordinate 18-electron species‚ and take the general from: [pic] If the A and B ligands in the product are considered to be formally –1‚ then the metal center has increased its oxidation state by +2‚ and this is the origin of the name oxidative addition. Oxidative reaction can occur when a metal complex
Premium Alkene Organic reaction Functional groups
is non-zero‚ unlike an insulator‚ yet still several magnitudes smaller than that of a conductor. There exists a significant energy gap between the filled valence – highest range of electron energies normally present at absolute zero – and empty conduction bands – range of energies which are enough to unbind the electron from the atom and allow it to move freely within the atomic lattice – in a semiconductor‚ unlike a conductor which has very small or no band gaps and/or an insulator which has very
Premium Semiconductor Electron Electric current
inversely proportional to the percent transmission for the yellow light which implied more photoelectrons were emitted for greater intensity. Stopping potentials for green light was noted to be higher than of yellow light. Ratio of Planck’s constant to electron charge and work function of the photocathode were determined experimentally from the plot of frequency vs. stopping potential from the first and second orders of spectral lines of mercury. The h/e ratio from the plot was 2.345 × 10-15 eV•s with 43
Premium Light Electron Quantum mechanics