Visible light (commonly referred to simply as light) is electromagnetic radiation that is visible to the human eye‚ and is responsible for the sense of sight. Visible light is usually defined as having a wavelength in the range of 400 nanometres (nm)‚ or 400×10−9 m‚ to 700 nanometres – between the infrared‚ with longer wavelengths and the ultraviolet‚ with shorter wavelengths. These numbers do not represent the absolute limits of human vision‚ but the approximate range within which most people can
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Cr2+ Cr3+ Mn2+ Mn3+ Symbols and Charges for Monoatomic Ions Name Symbol Name hydrogen ion H¯ hydride lithium ion F¯ fluoride Note that the sodium ion Cl¯ chloride letters in an ion’s potassium ion Br¯ bromide name before the rubidium ion I¯ iodide -ide ending is 2¯ cesium ion O oxide the stem. For 2¯ beryllium ion S sulfide example‚ the stem magnesium ion Se2¯ selenide for bromide is calcium ion Te2¯ telluride brom-. strontium ion barium ion Ag + silver
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Chemical elements listed by electro negativity This list contains the 118 elements of chemistry. The chemical elements of the periodic chart sorted by: | Electro- negativity | Name chemical element | Symbol | Atomic number | - Name alphabetically | 0.7 | Actinium | Ac | 89 | - Atomic number | 0.79 | Lanthanum | La | 57 | - Symbol | 0.82 | Potassium | K | 19 | - Atomic Mass | 0.82 | Strontium | Sr | 38 | - Electro negativity | 0.89 | Cerium | Ce | 58 | - Density | 0.89 | Thorium |
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Te I Xe technetium ruthenium rhodium palladium silver cadmium indium tin antimony tellurium iodine xenon 101.1 102.9 106.4 107.9 112.4 114.8 118.7 121.8 127.6 126.9 131.3 rubidium strontium yttrium zirconium niobium molybdenum 85.47 87.62 88.91 91.22 92.91 95.96(2) 55
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The Periodic Table is a chart which arranges the chemical elements in a useful‚ logical manner. Elements are listed in order of increasing atomic number‚ lined up so that elements which exhibit similar properties are arranged in the same row or column as each other. Elements are also arranged in different families and periods based on similar characteristics. Also the grouping of elements into into subcategories Metals‚ Nonmetals‚ and Metalloids. The Periodic Table is one of the most useful tools
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| 0.0037 | 0.0026 | 0.0012 | Yes/No (topically hardens teeth; toxic in higher amounts) | 17 | 30 | Zinc | 0.0032 | 0.0023 | 0.00031 | Yes (e.g. Zinc finger proteins) | 12 | 14 | Silicon | 0.002 | 0.0010 | 0.0058 | Yes (probable) | 14 | 37 | Rubidium | 0.00046 | 0.00068 | 0.000033 | No (?) | 1 | 38 | Strontium | 0.00046 | 0.00032 | 0.000033 | No (?) | 2 | 35 | Bromine | 0.00029 | 0.00026 | 0.000030 | No (?) | 17 | 82 | Lead | 0.00017 | 0.00012 | 0.0000045 | No (?) (toxic in higher amounts)
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iodine‚ and astatine. On the other hand alkali metals are extremely reactive because instead of gaining another electron like the halogens‚ alkali metals lose one or two electrons. Some examples of alkali metals are: lithium‚ sodium‚ potassium‚ rubidium‚ cesium‚ and francium. The noble gases all have similar properties under standard circumstances. They are all odorless‚ colorless and a very low ability to react with other chemicals. The noble gases are inert‚ meaning not reactive‚ because their
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Density Lab January 24‚ 2014 Benjamin I. Purpose- The purpose of this lab is to identify the unknown substances by calculating the densities of the given substances then comparing those densities to the actual densities on the table given. II. Materials- Graduated cylinders Triple beam balance Unknown substances from bag given by teacher Table of known densities Calculator Water III. Procedure- The first thing one must do to identify which substance is which is to calculate the
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Structure and bonding Ionic bonds are chemical bonds formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between an metal and a non-metal. The metal loses an electron or electrons form its highest energy level becoming a positively charged Ion and the non-metal gains an electron or electrons in its highest energy level‚ becoming a negatively charged Ion. Covalent bonds are strong bonds between two non-metal atoms. A covalent bond forms when two
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Rules for Naming and Writing Compounds I. Ionic Bonds • bonding between a metal and non-metal or the bond between a positive ion and a negative ion forming a binary compound. • end in the suffix "ide" • Or bonding between a metal and a complex ion. Steps in writing formulas: • • • • Use a periodic table of elements and of ions. Write the symbol and charge of the cation first (positive ion) Write the symbol and charge of the anion next (negative ion) Use criss-cross rule to balance for an electrically
Free Ion Sodium chloride Chlorine