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How is moseleys basis for arranging the elements different from mendelees?
Wiki User
∙ 11y ago
Moseley's basis and Mendeleev's basis both involved experimental measurements. But Moseley's involved X-ray properties, and X-rays were not discovered when Mendeleev first stated the Periodic Law.
Atomic weight and atomic number follow nearly the same sequence, but there are three cases of reversal of order:
Argon element 18 atomic weight 40.0; potassium element 19 atomic weight 39.1.
(Argon was not discovered until 1894; first Periodic Table 1869).
Cobalt element 27 atomic weight 58.9; nickel element 28 atomic weight 58.7.
(Very small difference; Mendeleev gave these two elements identical atomic weights)
Tellurium element 52 atomic weight 127.6; iodine element 53 atomic weight 126.9
(Major problem for Mendeleev -- he insisted that the atomic weight of tellurium had to be 125, but careful re-measurements continued to show 127.5-128)
Moseley's atomic number is definitely a better basis for the periodic law than Mendeleev's original suggestion of atomic weight.
Wiki User
∙ 11y ago
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Which two elements on the periodic tabel would have been placed in different groups in moseleys periodic table but not in mendeleevs?
bi and po
What is Henry Moseleys Nationality?
British
How was moseleys periodic table arranged?
Compared to Mendeleev's periodic table which was arranged my atomic mass, Moseley's was, however, arranged by atomic number.
Does the old periodic table increase by atomic number?
Yes depending on which scientists version of the periodic table you look at. Henry Moseleys ideas on the periodic table was the first to increase by atomic number.
What is the IIT-2009 syllabus?
IIT JEE 2010 Physics SyllabusGeneral:Units and dimensions, dimensional analysis; least count, significant figures; Methods of measurement and error analysis for physical quantities pertaining to the following experiments: Experiments based on using Vernier calipers and screw gauge (micrometer), Determination of g using simple pendulum, Youngs modulus by Searles method, Specific heat of a liquid using calorimeter, focal length of a concave mirror and a convex lens using u-v method, Speed of sound using resonance column, Verification of Ohms law using voltmeter and ammeter, and specific resistance of the material of a wire using meter bridge and post office box.Mechanics: Kinematics in one and two dimensions (Cartesian coordinates only), projectiles; Uniform Circular motion; Relative velocity.Newtons laws of motion; Inertial and uniformly accelerated frames of reference; Static and dynamic friction; Kinetic and potential energy; Work and power; Conservation of linear momentum and mechanical energy.Systems of particles; Centre of mass and its motion; Impulse; Elastic and inelastic collisions.Law of gravitation; Gravitational potential and field; Acceleration due to gravity; Motion of planets and satellites in circular orbits; Escape velocity.Rigid body, moment of inertia, parallel and perpendicular axes theorems, moment of inertia of uniform bodies with simple geometrical shapes; Angular momentum; Torque; Conservation of angular momentum; Dynamics of rigid bodies with fixed axis of rotation; Rolling without slipping of rings, cylinders and spheres; Equilibrium of rigid bodies; Collision of point masses with rigid bodies.Linear and angular simple harmonic motions.Hookes law, Youngs modulus.Pressure in a fluid; Pascals law; Buoyancy; Surface energy and surface tension, capillary rise; Viscosity (Poiseuilles equation excluded), Stokes law; Terminal velocity, Streamline flow, equation of continuity, Bernoullis theorem and its applications.Wave motion (plane waves only), longitudinal and transverse waves, superposition of waves; Progressive and stationary waves; Vibration of strings and air columns;Resonance; Beats; Speed of sound in gases; Doppler effect (in sound).Thermal Physics:Thermal expansion of solids, liquids and gases; Calorimetry, latent heat; Heat conduction in one dimension; Elementary concepts of convection and radiation; Newtons law of cooling; Ideal gas laws; Specific heats (Cv and Cp for monoatomic and diatomic gases); Isothermal and adiabatic processes, bulk modulus of gases; Equivalence of heat and work; First law of thermodynamics and its applications (only for ideal gases); Blackbody radiation: absorptive and emissive powers; Kirchhoffs law; Wiens displacement law, Stefans law.Electricity and magnetism:Coulombs law; Electric field and potential; Electrical potential energy of a system of point charges and of electrical dipoles in a uniform electrostatic field; Electric field lines; Flux of electric field; Gausss law and its application in simple cases, such as, to find field due to infinitely long straight wire, uniformly charged infinite plane sheet and uniformly charged thin spherical shell.Capacitance; Parallel plate capacitor with and without dielectrics; Capacitors in series and parallel; Energy stored in a capacitor.Electric current; Ohms law; Series and parallel arrangements of resistances and cells; Kirchhoffs laws and simple applications; Heating effect of current.Biot Savarts law and Amperes law; Magnetic field near a current-carrying straight wire, along the axis of a circular coil and inside a long straight solenoid; Force on a moving charge and on a current-carrying wire in a uniform magnetic field.Magnetic moment of a current loop; Effect of a uniform magnetic field on a current loop; Moving coil galvanometer, voltmeter, ammeter and their conversions.Electromagnetic induction: Faradays law, Lenzs law; Self and mutual inductance; RC, LR and LC circuits with d.c. and a.c. sources.Optics: Rectilinear propagation of light; Reflection and refraction at plane and spherical surfaces; Total internal reflection; Deviation and dispersion of light by a prism; Thin lenses; Combinations of mirrors and thin lenses; Magnification.Wave nature of light: Huygens principle, interference limited to Youngs double-slit experiment.Modern physics: Atomic nucleus; Alpha, beta and gamma radiations; Law of radioactive decay; Decay constant; Half-life and mean life; Binding energy and its calculation; Fission and fusion processes; Energy calculation in these processes.Photoelectric effect; Bohrs theory of hydrogen-like atoms; Characteristic and continuous X-rays, Moseleys law; de Broglie wavelength of matter waves.
