1- Look up the following elements and show their (atomic number‚ atomic mass‚ the symbol‚ number of electrons‚ protons and neutrons) the elements are Iron‚ copper‚ sodium‚ magnesium‚ chlorine‚ fluorine‚ carbon‚ hydrogen‚ oxygen. Element |Symbol |Atomic # |Mass # |#Protons |#Electrons |#Neutrons | |Iron |Fe |26 |26+26=52 |26 |26 |26 | |Copper |Cu |29 |29+29=58 |29 |29 |29 | |Sodium |Na |11 |11+11=22 |11 |11 |11 | |Magnesium |Mg |12 |12+12=24 |12 |12 |12 | |Chlorine |Ci |17 |17+17=34 |17 |17 |17
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4s2 3d10 4p6 5s2 4d2 b) Zr4+ exists because Zirconium structure contains 40 electrons. For Zirconium to become chemical stable it must lose 4 electrons (to become a noble gas). So that is why Zr4+ is formed. Compare the stability of the zr atom and zr ion. the electron configuration for Zr is [Kr] 4d2 5s2. Ions are formed by losing electrons in outer shells to obtain more stable electron configurations like those of noble gases. By losing 4 electrons‚ it would have the electron configuration
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the lab. It should include the name of the element (or unknown) examined and the color of the observed flame Identify each unknown from Part One of the lab and briefly explain why you identified each unknown as you did. The first unknown element sodium knew it was because she got yellow and each element corresponded a unique color. The second element potassium knew it was because I acquired a blue color‚ in the experiment verified that each element corresponded to a different color. Part
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Assigment 1: Foundations: Atoms‚ Molecules‚ and Ions 1.1 A 47.3-mL sample of ethyl alcohol (ethanol) has a mass of 37.32 g. What is its density? 1.2 If 116 g of ethanol is needed for a chemical reaction‚ what volume of liquid would you use? The density of ethanol is 0.789 g/mL 1.3 Battery acid is 40.0% sulfuric acid‚ H2SO4‚ and 60.0% water by mass. Its density is 1.31. Calculate the mass of pure H2SO4 in 100.0 mL of battery acid. 1.4 How many moles of atoms does 136.9 g of iron metal contain
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two or more elements in a fixed‚ definite proportion is a. A solution. b. A heterogeneous mixture. c. An alloy. d. A homogeneous mixture. e. A compound. 3) (2 points) Read the water level with the correct number of significant figures. a. 5.32 mL b. 5.3 mL c. 5.320 mL d. 5 mL e. 5.3200 mL 4) (2 points) When 2 elements form 2 different compounds‚ the masses of element B that combine with 1g of element A can be expressed
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As Chemistry Summary of how the atoms have changed throughout the years? One of the first founders of the idea of atoms was called Democritus‚ which was in 430 BC. He argued that there were an infinite number of different types of atoms. They were all different shape however they were made from the same stuff. He describes atoms as indivisible particles and also explained certain natural occurrences such as the existence of elements. Atomos (in ancient Greek) means “that which cannot be further
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electrically charged plates and magnets in the cathode ray tube and observing the deflection of the rays he had enough evidence to say that particles smaller than atoms existed. By doing this experiment multiple times he compiled enough data to conclude that the mass of one of these particles‚ which he called an electron‚ was lighter than an atom of hydrogen by around 2‚000 times. He also found the ratio of charge to mass (e/m) would be the same for any electron.
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Mini Proposal Faculty of Education University of Malaya Topic of Research: Development and Evaluation of Humanism Elements in teaching and learning ‘Periodic Table of Elements’ among Form 4 students Prepared by: LIM PEI LEE (PGJ 110010) Post Graduate for Master in Education (Science Education) Semester 2‚ Session 2011/2012‚ Education Faculty‚ University of Malaya. Table of Contents |No. |Contents
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Akasha also occasionally known as Eather is an ornate word for “Element of the Spirit”. Although some may get confused between Personal and Human spirit‚ there is a definitive line between the types. There are five elements used in Magick and they are all shown on the Pentagram or the Pentacle. They are Commonly only known as the four elements. Earth‚ Air‚ Fire and Water. As in the song "Earth‚Air‚Fire‚Water" By Lindie Lila. There is however some people who believe that three represent the Goddess
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Finding Ourselves in Moss‚ Feathers‚ and Atoms Do you ever forget about the impact nature has on you? Although people do not like to admit it‚ nature is something many people forget about and‚ as a result‚ neglect. Not only does nature keep everyone alive‚ but it also typically brightens the days of many just by being outside their windows. In the anthology Colors of Nature: Culture‚ Identity‚ and the Natural World‚ essays by authors such as Nalini Nadkarni‚ Al Young‚ and Jennifer Oladipo explore
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