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    INVISALIGN TEEN® Getting metal braces is probably at the very bottom of your list of things to do‚ with all the social activities‚ sports‚ school etc. that you have on your agenda. Now you don’t have to worry wearing metal braces anymore. Invisalign Teen® will straighten your teeth without the need for metal brackets and wires. Now you can still do all the things you enjoy doing without having to worry about your smile. ONLY YOU WILL KNOW The clear smooth plastic of the Invisalign Teen® aligners

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    enables the experimenter to use simple techniques with standard laboratory equipment‚ as well as to learn some descriptive chemistry. Cations are Alkali and Alkaline earth metals group‚ they are quite easily excited to higher energy states such that the energy supplied is sufficient. Alkali and Alkaline earth metals are very reactive metals that do not occur freely in nature. To investigate or verify the above concept an experiment was conducted with the following objectives: (1) perform flame and confirmatory

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    Metal Through the course of Beloved‚ metal has a powerful role in describing the slave experience: the slaves are chained‚ beaten‚ and repeatedly dehumanized by different forms of metal. Morrison utilizes metal in the novel as a dehumanizing factor‚ symbol of tenacity‚ and a vessel of memory to illustrate emotional and physical repression of the characters. Paul D refers to his heart as a “tin tobacco box‚” where he shuts away his memories and emotions generated from past brutalities. Through the

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    Flame Test Lab Report

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    A metal is a solid material which is either an element‚ a compound or an alloy. Metals share some common properties like being typically hard and shiny‚ and that metals are good electrical and thermal conductors. They are generally malleable‚ fusible and ductile. In a periodic table of elements‚ there are six groups of metals and two of them are the most common. It is the Alkali Metals and the Alkaline Earth Metals. Alkali metals comprise the group 1 elements. They are similarly shiny‚ soft

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    Chemistry Class 9th

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    THE s-BLOCK ELEMENTS 291 UNIT 10 THE s -BLOCK ELEMENTS The first element of alkali and alkaline earth metals differs in many respects from the other members of the group After studying this unit‚ you will be able to • describe the general characteristics of the alkali metals and their compounds; • explain the general characteristics of the alkaline earth metals and their compounds; • describe the manufacture‚ properties and uses of industrially important sodium and calcium

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    Magnesium Mg(Z=12) in Group 2 Alkaline Earth Metals The structure of the element: Giant lattice metallic structure of immobile positive metal ions surrounded by a ’sea’ of freely moving mobile electrons (so-called delocalised electrons). Physical properties:  A moderately hard silvery-white solid; mpt 649oC; bpt 1090oC; good conductor of heat/electricity. Group‚ electron configuration (and oxidation states):  Gp2 Alkaline Earth Metal; e.c.  2‚8‚2 or 1s2 2s2 2p6 3s2; (+2 only) e.g. MgCl2

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    heavy metal stress in plants

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    effect of heavy metals lead and cadmium (0.05 mM and 0.3 mM) on growth and antioxidant enzymes of seedlings of 2 mung bean genotypes (NM 19-19 and Azri mung-2006). Results revealed that germination percentage and seedling length decreased when compared with the control for both genotypes. However‚ seedling length and germination percentage was better in NM 19-19 as compared to Azri mung-2006. Elevated levels of protein were observed under metal stress in both genotypes. Heavy metals induced oxidative

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    Biology 10 Vinegar Eel Lab Adam Dorner 1) The most toxic metals were silver‚ lead and iron‚ all killing the eels in under four minutes‚ with silver taking only 1 minute and 40 seconds to kill the eels‚ and only 13 seconds to make the eels stop forward motion. Strontium wasn’t effective as after 5 minutes of exposure to it‚ the eels hadn’t died or stopped forward motion. 2) a) The accepted toxicity varies from metal to metal. The accepted toxic level of lead is 0.0012 parts per million‚ however

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    Ocean County College Department of Chemistry Identification of Metallic Ions Purpose: The purpose of this lab exercise was to perform and observe the flame tests of some alkali and alkaline earth metal ions. When electrons in metallic ions are grounded‚ their configuration is stable. In other words‚ the loosely bound electrons in the valence shell of the atom are satisfied at their “low” energy state. They do not require to be balanced by emitting any type of radiation or receiving any

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    Topic: Silver is an ancient mineral that dates back since prehistoric times. One thing that makes silver so special is that it was one of the first five metals that we started to use. Silver is found in almost every electronic device there is‚ and as time progresses the usage of it increases‚ unfortunately the amount there is left decreases. How is it created or source of the mineral? (5) Silver is not originated from Earth‚ as it happens it came from space. Many elements were formed in the big

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