history of the atom ppt student copy
... º used CRT to discover the electron. -modified CRT with poles (magnetic field) to attract cathode rays. - passed electricity through a gas at first; then used several samples of other elements. -behavior was same for all elements - rays were attracted to the anode (+). (__________________________) - ...
... º used CRT to discover the electron. -modified CRT with poles (magnetic field) to attract cathode rays. - passed electricity through a gas at first; then used several samples of other elements. -behavior was same for all elements - rays were attracted to the anode (+). (__________________________) - ...
Document
... Indeterminate quantum states “collapse” to definite values when they do, not when a human being catches them in the act ...
... Indeterminate quantum states “collapse” to definite values when they do, not when a human being catches them in the act ...
2. NH3 - Huffman Chemistry Website!
... Directions: Answer the following questions below. Show all work for full credit, label all units, put all calculation answers in correct scientific notation (when needed) and significant figures and BOX all answers. ...
... Directions: Answer the following questions below. Show all work for full credit, label all units, put all calculation answers in correct scientific notation (when needed) and significant figures and BOX all answers. ...
PowerPoint 演示文稿 - Shandong University
... The closed shell is spherically symmetric, and is strongly bound to the nucleus. The valence electron is located at a relatively large distance r from the nucleus. It moves in the electrostatic field of the nuclear charge +Ze, which is for the most part screened by the (Z-1) inner electrons. We desc ...
... The closed shell is spherically symmetric, and is strongly bound to the nucleus. The valence electron is located at a relatively large distance r from the nucleus. It moves in the electrostatic field of the nuclear charge +Ze, which is for the most part screened by the (Z-1) inner electrons. We desc ...
Chemistry 212 Name:
... These properties, in conjunction with low X2 bond energies make these elements highly reactive. Beginning with chlorine, all can form compounds with the halogen in a positive oxidation state (+1, 3, 5, & 7). They all exist as colored diatomic molecules. ...
... These properties, in conjunction with low X2 bond energies make these elements highly reactive. Beginning with chlorine, all can form compounds with the halogen in a positive oxidation state (+1, 3, 5, & 7). They all exist as colored diatomic molecules. ...
Term paper
... We can extend our calculations to p-orbitals and we find similar wave functions. But, other orbitals have directional character. When, pz has formed σ bond, there is lateral overlap which forms π bond. For heteronuclear atoms, we change the wavefunction to: ψ+ = φ+ +λφ− and ψ− = φ+ −λφ− where λ is a ...
... We can extend our calculations to p-orbitals and we find similar wave functions. But, other orbitals have directional character. When, pz has formed σ bond, there is lateral overlap which forms π bond. For heteronuclear atoms, we change the wavefunction to: ψ+ = φ+ +λφ− and ψ− = φ+ −λφ− where λ is a ...
Electromagnetic Spectrum activity
... Each sublevel contains orbitals (space occupied by a pair of electrons). The third quantum number, ml (magnetic quantum number) is used to describe each orbital within in a sublevel. There are 3 orbitals for the p sublevel, 5 orbitals for the d sublevel, and 7 orbitals for the f sublevel. Finally, t ...
... Each sublevel contains orbitals (space occupied by a pair of electrons). The third quantum number, ml (magnetic quantum number) is used to describe each orbital within in a sublevel. There are 3 orbitals for the p sublevel, 5 orbitals for the d sublevel, and 7 orbitals for the f sublevel. Finally, t ...
CHEM 11 Practice Exam 2
... 13) Which of the following is held together by ionic bonds? A) CS2 B) CO2 C) CaCl2 D) SO3 E) SiO2 14) Which noble gas is isoelectronic with an aluminum ion? A) helium B) neon C) argon D) krypton E) xenon ...
... 13) Which of the following is held together by ionic bonds? A) CS2 B) CO2 C) CaCl2 D) SO3 E) SiO2 14) Which noble gas is isoelectronic with an aluminum ion? A) helium B) neon C) argon D) krypton E) xenon ...
CHAPTER 4: Structure of the Atom
... The Bohr Model of the Hydrogen Atom Successes and Failures of the Bohr Model Characteristic X-Ray Spectra and Atomic Number Atomic Excitation by Electrons In the present first part of the paper the mechanism of the binding of electrons by a positive nucleus is discussed in relation to Planck’s theor ...
... The Bohr Model of the Hydrogen Atom Successes and Failures of the Bohr Model Characteristic X-Ray Spectra and Atomic Number Atomic Excitation by Electrons In the present first part of the paper the mechanism of the binding of electrons by a positive nucleus is discussed in relation to Planck’s theor ...
CHEM 121 Chp 2 Spaulding
... The electrons in the valence shell are called valence electrons The chemical properties of an element depend on the number of electrons in the valence shell ...
... The electrons in the valence shell are called valence electrons The chemical properties of an element depend on the number of electrons in the valence shell ...
Electrophilic Additions to Double Bonds
... Hamiltonian for an orbital is the orbital energy each orbital sees the average distribution of all the other electrons finding a many electron wavefunction is reduced to finding a series of one electron orbitals ...
... Hamiltonian for an orbital is the orbital energy each orbital sees the average distribution of all the other electrons finding a many electron wavefunction is reduced to finding a series of one electron orbitals ...
CHEM 121
... b. What conclusion is drawn from the observation that the emission and absorption spectra of atoms are line spectra? Only certain energy levels must be available to the electrons in an atom. 13. What do we mean when we say that something is quantized? it can have only certain discrete (noncontinuous ...
... b. What conclusion is drawn from the observation that the emission and absorption spectra of atoms are line spectra? Only certain energy levels must be available to the electrons in an atom. 13. What do we mean when we say that something is quantized? it can have only certain discrete (noncontinuous ...
Revision sheet and answer1
... Type Four 3) because each orbital is occupied by two electrons . S orbital consists of one orbital and P orbital consists of 3 orbitals 6) because 4s has lower energy than 3d 9) because noble gases have their outermost energy level completely filled ( stable ) , So it’s difficult to remove electron ...
... Type Four 3) because each orbital is occupied by two electrons . S orbital consists of one orbital and P orbital consists of 3 orbitals 6) because 4s has lower energy than 3d 9) because noble gases have their outermost energy level completely filled ( stable ) , So it’s difficult to remove electron ...
AP Chemistry 2013 Semester 1 Final Exam Review Problems
... 12. An electron microscope employs a beam of electrons to obtain an image of an object. What energy must be imparted to each electron of the beam to obtain a wavelength of 10.0pm? Using the formula KE = ½mv2, calculate the energy in electron volts (eV) (1eV = 1.602 x 10-19J) 13. What is the differen ...
... 12. An electron microscope employs a beam of electrons to obtain an image of an object. What energy must be imparted to each electron of the beam to obtain a wavelength of 10.0pm? Using the formula KE = ½mv2, calculate the energy in electron volts (eV) (1eV = 1.602 x 10-19J) 13. What is the differen ...
Chemistry (B) Final Exam Study Guide 1
... ____ 50. How does the energy of an electron change when the electron moves closer to the nucleus? a. It decreases. c. It stays the same. b. It increases. d. It doubles. ____ 51. What is the shape of the 3p atomic orbital? a. sphere c. bar b. dumbbell d. two perpendicular dumbbells ____ 52. What is ...
... ____ 50. How does the energy of an electron change when the electron moves closer to the nucleus? a. It decreases. c. It stays the same. b. It increases. d. It doubles. ____ 51. What is the shape of the 3p atomic orbital? a. sphere c. bar b. dumbbell d. two perpendicular dumbbells ____ 52. What is ...
LEP 5.1.03 -15 Franck-Hertz experiment with Ne-tube
... angular momentum of the electron is an integral multiple of h/2p, i.e. n*h/2p, where n is an integer and h is Planck’s constant. Bohr’s picture of electrons in discrete states with transitions among those states producing radiation whose frequency is determined by the energy differences between stat ...
... angular momentum of the electron is an integral multiple of h/2p, i.e. n*h/2p, where n is an integer and h is Planck’s constant. Bohr’s picture of electrons in discrete states with transitions among those states producing radiation whose frequency is determined by the energy differences between stat ...
File
... 24. What are Valence electrons? Electrons on the outermost energy level of an atom 25. How many electrons can the 1st, 2nd and 3rd energy levels hold? 1st level can hold up to 2; 2nd level can hold up to 8; 3rd level can up hold up to 8 (with exceptions with periods past the 3rd level) 26. Which gro ...
... 24. What are Valence electrons? Electrons on the outermost energy level of an atom 25. How many electrons can the 1st, 2nd and 3rd energy levels hold? 1st level can hold up to 2; 2nd level can hold up to 8; 3rd level can up hold up to 8 (with exceptions with periods past the 3rd level) 26. Which gro ...
Electron configuration
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s2 2s2 2p6.Electronic configurations describe electrons as each moving independently in an orbital, in an average field created by all other orbitals. Mathematically, configurations are described by Slater determinants or configuration state functions.According to the laws of quantum mechanics, for systems with only one electron, an energy is associated with each electron configuration and, upon certain conditions, electrons are able to move from one configuration to another by the emission or absorption of a quantum of energy, in the form of a photon.Knowledge of the electron configuration of different atoms is useful in understanding the structure of the periodic table of elements. The concept is also useful for describing the chemical bonds that hold atoms together. In bulk materials, this same idea helps explain the peculiar properties of lasers and semiconductors.