Presentazione di PowerPoint
... Stacked image of 23 BzK galaxies; HR< -0.5 @ 2sigma ; L2-10~1042 erg/sec SFR ~ 170 Myr-1 (4 higher than LBG). SFRD of 0.04 M⊙ /yr/Mpc3 We are witnessing the massive spheroid formation epoch (the peak of just the low-z tail?) Daddi et al. 2004 ...
... Stacked image of 23 BzK galaxies; HR< -0.5 @ 2sigma ; L2-10~1042 erg/sec SFR ~ 170 Myr-1 (4 higher than LBG). SFRD of 0.04 M⊙ /yr/Mpc3 We are witnessing the massive spheroid formation epoch (the peak of just the low-z tail?) Daddi et al. 2004 ...
MIDTERM EXAM – JANUARY, 2003
... 73. Describe how ionization energy changes as you move across the periodic table. 74. Describe how electronegativity changes as you move across the periodic table. 75. The transition metals occupy the ______________ block of the periodic table 76. The alkali metals and alkaline earth metals occupy t ...
... 73. Describe how ionization energy changes as you move across the periodic table. 74. Describe how electronegativity changes as you move across the periodic table. 75. The transition metals occupy the ______________ block of the periodic table 76. The alkali metals and alkaline earth metals occupy t ...
Chapter 2 Chemical context of Life
... The electrons of an atom have potential energy because of how they are arranged in relation to the nucleus. Electrons are attracted by the positive nucleus. It takes energy to move electrons farther away from the nucleus. Electrons have fixed amounts of potential energy that correspond to a position ...
... The electrons of an atom have potential energy because of how they are arranged in relation to the nucleus. Electrons are attracted by the positive nucleus. It takes energy to move electrons farther away from the nucleus. Electrons have fixed amounts of potential energy that correspond to a position ...
First of all, do you know any methods to check
... Sensitivity of AES: ~0.1 atomic% of a monolayer! Error in AES: analysis: < 15%, Error within a few % can be achieved with better standards and calibration. Take care Sensitivities Si for peak to peak height of differentiated Auger peak different from the one for original Auger peak(with background s ...
... Sensitivity of AES: ~0.1 atomic% of a monolayer! Error in AES: analysis: < 15%, Error within a few % can be achieved with better standards and calibration. Take care Sensitivities Si for peak to peak height of differentiated Auger peak different from the one for original Auger peak(with background s ...
Review for Midyear - 1 KEY - Ms. Robbins` PNHS Science Classes
... Determine the number of protons, neutrons and electrons in Hydrogen-1, hydrogen-2, and hydrogen-3 All have 1 p+ and 1 e- Hydrogen-1 has no neutrons, Hydrogen-2 has 1 neutron, and Hydrogen-3 has 2 neutrons The last digit of an element’s group number is equal to its number of valence electrons. Which ...
... Determine the number of protons, neutrons and electrons in Hydrogen-1, hydrogen-2, and hydrogen-3 All have 1 p+ and 1 e- Hydrogen-1 has no neutrons, Hydrogen-2 has 1 neutron, and Hydrogen-3 has 2 neutrons The last digit of an element’s group number is equal to its number of valence electrons. Which ...
L129 DISCOVERY OF A NEW 89 SECOND X
... distribution of matter in the vicinity. The scattering cross section is also energy dependent, and hence the pulse profile is expected to vary with energy. In addition, at lower energies, more complicated pulsar light curves are expected due to photoelectric absorption by material around the neutron ...
... distribution of matter in the vicinity. The scattering cross section is also energy dependent, and hence the pulse profile is expected to vary with energy. In addition, at lower energies, more complicated pulsar light curves are expected due to photoelectric absorption by material around the neutron ...
Chem Regents 2015 A Few Things
... Boiling occurs when the vapor pressure = atmospheric pressure “normal boiling point” = boiling point at 1 atm pressure (101.3 kPa) ...
... Boiling occurs when the vapor pressure = atmospheric pressure “normal boiling point” = boiling point at 1 atm pressure (101.3 kPa) ...
Part One: Molecular Geometry and Directional Bonding A
... (2s atomic orbital) + 3 (2p atomic orbitals) mix together to produce 4 equal sp3 hybrid orbitals arranged in a tetrahedron: ...
... (2s atomic orbital) + 3 (2p atomic orbitals) mix together to produce 4 equal sp3 hybrid orbitals arranged in a tetrahedron: ...
Topic 4: Classifying Elements What did the early chemists use to
... EXAMPLES: O2(g), H2(g) à there are others but know these Name the following examples of MOLECULAR COMPOUNDS (see your notes or textbook to help you): • CO2(g) à carbon dioxide • NH3(g) à nitrogen ...
... EXAMPLES: O2(g), H2(g) à there are others but know these Name the following examples of MOLECULAR COMPOUNDS (see your notes or textbook to help you): • CO2(g) à carbon dioxide • NH3(g) à nitrogen ...
1.5.16(Chem) - mrcarlsonschemistryclass
... Cations and Anions • Cations are ions with a POSITIVE charge. • Anions are ions with a NEGATIVE charge. • Draw the funny way to remember cations and anions: ...
... Cations and Anions • Cations are ions with a POSITIVE charge. • Anions are ions with a NEGATIVE charge. • Draw the funny way to remember cations and anions: ...
Atoms and Spectral Lines
... • Chemical element: Defined by the number of protons in the atomic nucleus ("atomic number") • Isotope: Each element can have different isotopes, defined by number of neutrons. – Only a few isotopes of each element are stable (the others are radioactive and come apart quickly): – there are typically ...
... • Chemical element: Defined by the number of protons in the atomic nucleus ("atomic number") • Isotope: Each element can have different isotopes, defined by number of neutrons. – Only a few isotopes of each element are stable (the others are radioactive and come apart quickly): – there are typically ...
The Periodic Table - Mrs Molchany`s Webpage
... Reason: Moving down a group the average distance between the added electron and the nucleus steadily increases, causing the electron-nucleus attraction to decrease. The orbital that holds the outermost electron is increasingly spread out, however, proceeding down the group, reduces the electron-elec ...
... Reason: Moving down a group the average distance between the added electron and the nucleus steadily increases, causing the electron-nucleus attraction to decrease. The orbital that holds the outermost electron is increasingly spread out, however, proceeding down the group, reduces the electron-elec ...
Chemistry Reference Table Review
... 65. What is the half-life and decay mode of Rn-222? (1) 1.912 days and alpha decay (2) 1.912 days and beta decay (3) 3.823 days and alpha decay (4) 3.823 days and beta decay 66. Which notation represents an atom of sodium with an atomic number of 11 and a mass number of 24? ...
... 65. What is the half-life and decay mode of Rn-222? (1) 1.912 days and alpha decay (2) 1.912 days and beta decay (3) 3.823 days and alpha decay (4) 3.823 days and beta decay 66. Which notation represents an atom of sodium with an atomic number of 11 and a mass number of 24? ...
Exam Review - Manistique Area Schools
... What does each line in a atomic emission spectrum represent? Why are there spaces between the lines of color? Why do we see one color? ...
... What does each line in a atomic emission spectrum represent? Why are there spaces between the lines of color? Why do we see one color? ...
Heaven on Earth - Max-Planck
... the processes that occur when electrons are attached, and when the molecule subsequently breaks apart like balls on a billiard table. Andreas Wolf and his colleagues used this method to study a number of attachment reactions. One of the most recent examples is the hydronium ion H3O+. It is particula ...
... the processes that occur when electrons are attached, and when the molecule subsequently breaks apart like balls on a billiard table. Andreas Wolf and his colleagues used this method to study a number of attachment reactions. One of the most recent examples is the hydronium ion H3O+. It is particula ...
Bonding
... (atomic number 34). c.In terms of atomic structure, explain why the first ionization energy of selenium is i. less than that of bromine (atomic number 35), and ii.greater than that of tellurium (atomic number 52). d.Selenium reacts with fluorine to form SeF4. Draw the complete Lewis electron dot str ...
... (atomic number 34). c.In terms of atomic structure, explain why the first ionization energy of selenium is i. less than that of bromine (atomic number 35), and ii.greater than that of tellurium (atomic number 52). d.Selenium reacts with fluorine to form SeF4. Draw the complete Lewis electron dot str ...
Atoms in Combination: The Chemical Bond
... Sodium, a highly reactive element, readily transfers its single valence electron to chlorine, which is one electron shy of the “magic” number 18. The result is the ionic compound sodium chloride—ordinary table salt. In these diagrams, electrons are represented as dots in shells around a nucleus. ...
... Sodium, a highly reactive element, readily transfers its single valence electron to chlorine, which is one electron shy of the “magic” number 18. The result is the ionic compound sodium chloride—ordinary table salt. In these diagrams, electrons are represented as dots in shells around a nucleus. ...
Mass Spectroscopy
... Separation of Ions • Only the cations are deflected by the magnetic field. • Amount of deflection depends on m/z. • The detector signal is proportional to the number of ions hitting it. • By varying the magnetic field, ions of all masses are collected and counted. => ...
... Separation of Ions • Only the cations are deflected by the magnetic field. • Amount of deflection depends on m/z. • The detector signal is proportional to the number of ions hitting it. • By varying the magnetic field, ions of all masses are collected and counted. => ...
Ch 4 - USD305.com
... • Groups 1 and 2, same # of electrons as group #, 312 have 2 or more, 13-18 same as group # -10 except for helium (only has 2) • Metals – Alkali, alkaline-earth, transition, others ...
... • Groups 1 and 2, same # of electrons as group #, 312 have 2 or more, 13-18 same as group # -10 except for helium (only has 2) • Metals – Alkali, alkaline-earth, transition, others ...
Metastable inner-shell molecular state
Metastable Innershell Molecular State (MIMS) is a class of ultra-high-energy short-lived molecules have the binding energy up to 1,000 times larger and bond length up to 100 times smaller than typical molecules. MIMS is formed by inner-shell electrons that are normally resistant to molecular formation. However, in stellar conditions, the inner-shell electrons become reactive to form molecular structures (MIMS) from combinations of all elements in the periodic table. MIMS upon dissociation can emit x-ray photons with energies up to 100 keV at extremely high conversion efficiencies from compression energy to photon energy. MIMS is predicted to exist and dominate radiation processes in extreme astrophysical environments, such as large planet cores, star interiors, and black hole and neutron star surroundings. There, MIMS is predicted to enable highly energy-efficient transformation of the stellar compression energy into the radiation energy.The right schematic illustration shows the proposed four stages of the K-shell MIMS (K-MIMS) formation and x-ray generation process. Stage I: Individual atoms are subjected to the stellar compression and ready for absorbing the compression energy. Stage II: The outer electron shells fuse together under increasing ""stellar"" pressure. Stage III: At the peak pressure, via pressure ionization K-shell orbits form the K-MIMS, which is vibrationally hot and encapsulated by a Rydberg-like pseudo-L-Shell structure. Stage IV: The K-MIMS cools down by ionizing (""boiling-off"") a number of pseudo-L-shell electrons and subsequent optical decay by emitting an x-ray photon. The dissociated atoms return their original atoms states and are ready for absorbing the compression energy.MIMS also can be readily produced in laboratory and industrial environments, such as hypervelocity particle impact, laser fusion and z-machine. MIMS can be exploited for highly energy-efficient production of high intensity x-ray beams for a wide range of innovative applications, such as photolithography, x-ray lasers, and inertial fusion.