Magnetic Properties of Solids Magnetic Properties Magnetic (with unpaired electron) Materials Non-magnetic or diamagnetic (electrons all paired up) Paramagnetic Ferromagnetic Antiferromagnetic Ferrimagnetic Magnetic Behavior B = μH B = μ0H + μ0M Induction generated Induction generated by the field by the sample B: magnetic flux density μ: permittivity (m0: free space) H: magnetic field M: Magnetization χ = M/H χ: magnetic susceptibility B = μ0H + μ0Hχ B = μ0H (1 + χ) = μH
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JC1 H2 Chemistry Atomic Structure Tutorial 1. How many protons‚ neutrons and electrons are there in 3+ ion? 2. Write down the electronic configuration of (a) Si (atomic no. 14) (b) Sc (atomic no. 21) (c) Co (atomic no. 27) 3. Which of the following ions contains an unpaired electron? A calcium ion B copper(II) ion C potassium ion D titanium(IV) ion 4. Some isotopes are unstable and decompose naturally. In one type of decomposition‚ a neutron in the nucleus decomposes to form a proton‚ which is
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H2 Chemistry 9647 Term 3 Block Test 2010 – Examiner’s report H2 CHEMISTRY 9647 Paper 2 (Section A) Structured Questions Question 1 – Atomic Structure and Redox Titration Most elements exist in nature as mixture of isotopes. At present‚ there are about 1600 known isotopes‚ of which only one-sixth are stable. The unstable isotopes lose energy by emitting ionising particles or radiation through the process of radioactive decay. Ernest Rutherford and later Paul Villard discovered the three
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all atoms involved stays the same. The Bohr Model and Quantum Theory 12. The probability region through which an electron may move is a(n) __orbital________. 13. At a p sublevel‚ there are (how many) _3__ orbitals. At an s sublevel‚ there are __1_ orbitals. At a d sublevel there are _5__ orbitals. 14. The maximum number of electrons possible to any p sublevel is ___6________. 15. What was Bohr’s major contribution to our understanding of atomic structure? Bohr originated the idea of different energy
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Materials 1 spectroscope 1 incandescent bulb 1 hydrogen gas discharge tube 1 mercury discharge tube 1 nitrogen gas discharge tube 1 fluorescent light 1 neon gas discharge tube Solar light source 1 discharge tube apparatus Procedure The procedure of using a spectroscope was practiced with a fluorescent light source. The slit was pointed towards the source‚ and the spectroscope was shifted until the spectrum was clearly visible. The appearance of the spectrum from the fluorescent light
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transitions [24]. Figure 4 shows the UV-Vis spectra of CAC and TAC. As seen from the data of Table 4‚ the electron transition from HOMO-2 orbital to LUMO orbital of trans isomer of azocubane (TAC) is happened at 251.7 nm. In contrast‚ three electronic transitions are happened in CAC. The important one corresponds to the transition from HOMO-1 orbital to LUMO orbital. It is observed this transition is done at 248.9
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premolars as well as the neighboring gingiva. The infraorbital artery‚ a continuation of the maxillary artery‚ enters the orbit through the inferior orbital fissure‚ lies in the infraorbital groove‚ leaves the orbit via the infraorbital canal‚ and enters the face by way of the infraorbital foramen. Branches of the infraorbital artery are the orbital branches‚ serving the lacrimal gland and the inferior oblique and inferior rectus muscles; the anterior superior alveolar
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INORGANIC CHEMISTRY – CLASS XI (ISC) Properties of Group 1 elements [Alkali metals] 1. Due to high reactivity‚ alkali metals do not occur free in nature. Elements of group 1 (or IA) are known as alkali metals because their hydroxides are soluble in water and form strongly alkaline solutions. Alkali metals are stored under kerosene oil because they get tarnished on exposure to air. 2. The general electron configuration of alkali metals is ns1. 3. Alkali metals have largest size and lowest
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1s22s22p63s1. When sodium atoms come together‚ the electron in the 3s atomic orbital of one sodium atom shares space with the corresponding electron on a neighbouring atom to form a molecular orbital - in much the same sort of way that a covalent bond is formed.The difference‚ however‚ is that each sodium atom is being touched by eight other sodium atoms - and the sharing occurs between the central atom and the 3s orbitals on all of the eight other atoms. And each of these eight is in turn being touched
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moon—whose orbital radius (r) is 64‚780 kilometers and whose orbital period (P) is 38.200 days—and knowing that the gravitational constant G= 6.673×〖10〗^(-11) m^3 〖kg〗^(-1) s^(-2)(where m= meters‚ kg= kilograms‚ and s=seconds). Express the answer in units of Earth Mass (M_Earth)‚ knowing that M_Earth= 5.980×〖10〗^24 kg. (Hint: first express r and p in standard units: meters and seconds.) Given: M=(4π^2 r^3)/(GP^2 ) is known as Kepler’s Third Law where P is the orbital period‚ r is the orbital radius
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