Hestia Livana Partners : Rachel Gideon‚ Joy Boake‚ Hannah Harper Various Color of Light as the Effect of Electron Emission Objective Observe the characteristic colors produced by certain metallic ions when vaporized in a flame. Identify the unknown metallic ions by means of its flame tests. Background When atoms absorb energy‚ electrons move into higher energy levels‚ and these electrons lose energy by emitting light when they return to lower energy levels. Energy levels are fixed energies
Premium Light Electromagnetic radiation Quantum mechanics
CHEMISTRY 1 (FSC 1114) CHEMICAL BONDING MOKAN A/L VELAN (SCPNG0000019030) SANDEEP SINGH JASPREET SINGH TABLE OF CONTENT Contents IONIC BOND 2 METALLIC BOND 9 The "Sea of Electrons" Theory 14 Conductors‚ Insulators and Semiconductors 16 25 IONIC BOND Ionic bond is formed when electron transferred from a valence shell of an atom to the valence shell of another atom. Ionic bond involves electron transfer across two atoms. The atom which donates the electron is called cation
Premium Ion Atom Electron
Name: __Huram-abi ________________________ Date: 9/20/2012______________________ Student Exploration: Mineral Identification Vocabulary: crystal‚ density‚ hardness‚ homogeneous‚ luster‚ mass‚ mineral‚ streak‚ volume Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Suppose you find a yellow piece of metal in a stream. How could you tell if it is real gold? _To tell if it’s real gold check out it’s density‚ find it’s mass and volume‚ see if it’s luster
Premium Mineral Lead
corrosion‚ they change into metallic ions. In some cases‚ the product of corrosion itself forms a protective coating. "For example‚ aluminium forms a thin protective oxide layer which is impervious to air and water. In other cases (e.g. iron)‚ however‚ the coating either flakes off or is pervious to both air and water. So the whole piece of metal can corrode right through." The most common forms of metallic corrosion are caused by electrochemical reactions‚ wherein two metallic phases (e.g.‚ iron oxide
Premium Corrosion Metal Iron
Bonding structure Metals: metallic bonding Ionic compound (metal +nonmetal): ionic bonding Molecule (nonmetal +nonmetal): covalent bonding 3.1 Metallic Bonding 1) Definition The electrostatic attraction between a lattice if positive ions and delocalized electrons. 2) The strength of metallic bonding (depend on) Delocalized electrons (=valence electrons=Group number) More valence electrons‚ stronger metallic bonding Ionic radii (=distance between nucleus and e-) Greater ionic radius
Premium Chemical bond Electron Covalent bond
mineral in its powdered form. * Luster - is used to describe how light is reflected from the surface of a mineral. The basic distinction to be made is that of “metallic” versus “non-metallic”. -Metallic Luster - Minerals exhibiting metallic luster look like metal‚ such as a silvery appearance or that of a flat piece of steel. -Non-Metallic Luster Vitreous: The luster of glass. Resinous: The luster of resin. Pearly: The luster of pearls. Greasy: Looks like it is covered in a thin layer of oil
Premium Mineral
+ website The elements in Period 3 of the periodic table are the elements sodium to argon. They represent the most straightforward trend in properties. As the atomic number of the elements increases across a period‚ the trend is from metallic to a non-metallic character. Electronegativity is a measure of an element’s ability to attract a shared electron pair to itself. Metals have a smaller electronegativity than 1.7 and non metals greater than 2.4. As the size of an atom decreases the electronegativity
Free Periodic table Atom Chemical element
Geology a science that examines the earth‚ its form and composition‚ and the changes it has undergone and is undergoing involves the knowledge of what happened before and the events occurring within the atmosphere requires not only a study of the materials found on earth but an understanding of the various geologic processes aims to develop an understanding of the earth’s materials and how these materials were changed and modified through the action of natural forces over a period of time Geology
Premium Volcano Igneous rock Sedimentary rock
is a metallic disk attached to one end of a copper rod. 2) To the other end of the copper rod‚ two thin gold metal leaves are attached. (Usually of gold. Can also be of another metal.) 3) The side of the copper rod with the thin gold leaves is fitted inside a conical flask‚ through a non-conducting rubber-cork. 4) The thin gold leaves are used in a electroscope to make it more sensitive. WORKING OF A GOLD-LEAF ELECTROSCOPE:- 1) If an uncharged body is brought and touched on the metallic disk
Premium Gold Electric charge
Electron Configuration: [Ar]4s23d104p4 Oxidation States: 6‚ 4‚ -2 Selenium is a non metallic chemical element‚ member of the group XVI of the periodic table. In chemical activity and physical properties it resembles sulfur and tellurium. Selenium appears in a number of allotropic forms: the most popular are red amorphous powder‚ a red crystalline material‚ and a gray crystalline metallike form called metallic selenium. This last form conducts electricity better in the light than in the dark and
Premium