principal quantum number n = 3‚ can be accommodated in an atom? A 6 B 9 C 14 D 18 6. The first ionisation energies‚ in kJ mol-1‚ of Group II and III elements are given below: Group II Group III Be 900 B 799 Mg 736 Al 577 Ca 590 Ga 578 (a) Define‚ by means of an equation‚ what is meant by the first ionisation energy of an element. (b) Explain why the first ionisation energies decrease in magnitude on descending Group II. (c) Explain why the first ionisation energy of aluminium
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planet Superman is from‚ but it is actually a chemical element. Krypton is one of the rarest gases on Earth which makes it very expensive. It can also be found in Mars’s atmosphere‚ but only makes up 0.3 parts of a million. Krypton was discovered in 1898 by Morris Travers and Sir William Ramsey. It was named after the Greek word‚ kryptos‚ which means “hidden”. The basic facts: Noble gases carry the trait of not reacting with many elements and Krypton is classified in this group. It is located
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support at the time‚ he could not elaborate on his suggestion. That’s where John Dalton came in…..2000 years later. Dalton used experimental methods to changed Democritus’s idea into a scientific theory. Dalton then began analyzing the ratios in which elements merge in chemical reactions. After doing several experiment‚ Dalton’s atomic theory was created. The four parts of his theory – as seen on page 103 in your Pearson Chemistry textbook - can be found
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extinguishes. For this‚ it depends on five elements: the earth‚ water‚ air‚ ether and fire. To make it easier to understand‚ we can bring in the five senses and its objects: sight‚ smell‚ taste‚ sound and touch. According to Ayurveda‚ life or existence is not a rigid compartment‚ but a harmonious flow. Even these five elements‚ of which the whole universe is made‚ are not tight compartments of defined objects. They flow into one another. Each one of the elements contains the other four. The subtlest
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mixtures * * Identify the difference between elements‚ compounds and mixtures in terms of particle theoryElements are substances made of one kind of atomCompounds are substances made of more than one atom chemically bonded. Mixtures are impure substances that can contain more than one kind of atom that are not chemically bonded. | * Identify that the biosphere‚ lithosphere‚ hydrosphere and atmosphere contain examples of mixtures of elements and compoundsBiosphere: In the Biosphere some natural
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must meet three elements to establish a defense of necessity to DUI. He will likely meet all three elements because he drove under the influence only to prevent a significant evil‚ the harm he caused was disproportionate to the harm avoided‚ and driving was his last adequate option in hopes to avoid the impending dangers of Hurricane Katrina. ESCAPE Probably yes. McAnzen will probably be able to evade an escape charge because under Mississippi Law a prisoner must meet four elements to establish
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determine the elements present in them but they do not give the actual structure or the functional groups present. Since all organic compounds contain hydrogen and carbon‚ most tests consist of only the determination of oxygen‚ sulfur‚ nitrogen and halogens – elements that are most of the time the only ones involved in organic compounds. The experiment focused on the Sodium Fusion test‚ which tested for all elements except oxygen. In the test‚ the test compound is broken down into its elements‚ which then
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dewees (vd866) – Exam review – dewees – (24127) This print-out should have 35 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Elements can be distinguished by their 1. hardness. 2. transparency. 3. dissolves in carbon disulfide 4. density of 2.07 g/ml 005 10.0 points Which of these substances I) table salt II) the liquid called coffee III) mercury is a mixture? 3. brittleness. 1. II and III only 4. density. 2. All
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periodic table. The table is laid out in the order of the atomic weight of each element. He wrote‚ in his book‚ that he arranged every element known to man just by their atomic mass and weight. He understood the science of elements and how they worked better than anyone else of his day. He guessed about future elements‚ as well‚ and what their properties might be. He also provided places for these possible new elements in the periodic table. At the time‚ however‚ a lot of people did not care for
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Matter: anything that has mass and takes up space Particle Theory: the scientific statements that summarize about particles of matter 1. All matter is made up of particles that contain spaces between each particle 2. Different substances are made up of different types of particles 3. Particles are always in constant motion 4. The movement of particles will increase if temperature rises 5. Particles are attracted to each other Pure substance: a substance that consists of only 1 type of particle
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