Periodic Table The periodic table has been updated all throughout history. Elements have been around us since the beginning of time. Elements‚ such as gold and silver‚ are examples of these elements that have been known for centuries. The periodic table allows us to see the elements in their families so we can understand what properties they have. It also allows us to see the atomic number‚ atomic mass‚ and the symbol of the element. The periodic table is a source of knowledge that is still being updated
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compound is a substance in which atoms of different elements are chemically held to one another. A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs. A mixture can usually be separated back into its original components‚ a compound cannot. Below are some examples of the differences between each. Compounds •Compounds are pure substances. •They are made up of two or more elements combined chemically. •The constituents of a compound
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are the competency Units and Elements. These elements must be addressed in the Summary Statement (see Section C). If you are applying for assessment as an Engineering Associate‚ you will need to download this page‚ complete it‚ and lodge it with your application. |Competency Element |A brief summary of how you have applied the |Paragraph in the career episode(s) | | |element
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Elements‚ Mixtures and Compounds An element is a pure substance made of one type of particle (atom). Particles can join up with other particles of the same type to form molecules. Examples: Hydrogen = H2 . This means there are two atoms of hydrogen joined together to form a molecule of hydrogen gas. Oxygen = O2‚ Nitrogen is H2‚ Chlorine is Cl2. A compound is a pure substance of two or more elements chemically combined together in a set ratio. Example: Water = H20 this means there are always
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Periodically Puzzling Here are some questions about the elements‚ their properties‚ and periodicity. In each case‚ the correct answer is the name of an element (one of the two given). Write the answer in the appropriate space at the right‚ placing the first letter in the first blank. There are more than enough blanks to fit either element name‚ so the number of letters in the name cannot be used as a clue. When the puzzle is complete‚ the Periodic Law will be displayed in the highlighted column
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Conditions- Solid 5. Astatine At Normal Conditions- Solid Give the names and formulas of three compounds that contain one element from the Noble Gas family. 1. Helium He 2. Neon Ne 3. Argon Ar 4. Krypton Kr 5. Xenon Xe 6. Radon Rn Look up the elements in group 15 from period 2 - 5‚ give the name and symbol of each. Give a biological use for each (click on the element and then on the term "biology" in the margin). 1. Nitrogen N nitrogen is a key component of biological molecules such
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THIS IS A LEGACY SPECIFICATION H Thursday 26 January 2012 – Morning GCSE GATEWAY SCIENCE ADDITIONAL SCIENCE B B623/02 Unit 1 Modules B3 C3 P3 (Higher Tier) * B 6 2 0 7 6 0 1 1 2 * Candidates answer on the Question Paper. A calculator may be used for this paper. Duration: 1 hour OCR supplied materials: None Other materials required: • Pencil • Ruler (cm/mm) * B 6 2 3 0 2 * INSTRUCTIONS TO CANDIDATES • • • • • • Write your name‚ centre number
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arrangements to the following elements: Carbon‚ Fluorine‚ magnesium‚ sulfur 2) Write the electron arrangements of the following elements using the format shown above: lithium‚ sodium‚ potassium‚ beryllium‚ magnesium‚ calcium lithium:2‚1 sodium:2‚8‚1 potassium:2‚8‚8‚1 beryllium:2‚2 magnesium: 2‚8‚2 calcium: 2‚8‚8‚2 The periodic table 1) Draw a table showing which of the following elements are from the S block and
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equals the atomic number NAME:________________________________________ Ion Practice Set 1. What is an ion? 2. What does the number next to the ions signify? Complete the following table‚ using the periodic table in the back of your book. ELEMENT NAME ION SYMBOL NUMBER OF PROTONS NUMBER OF ELECTRONS NUMBER OF ELECTRONS LOST OR GAINED ex Fluorine F- 9 10 gained one 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 lithium Rb+ Haluminum Sr+2 H+ potassium Ca+2 53 16 54 gained two
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The rich imagery in ‘Dulce et Decorum Est’‚ is a major reason why the poem is so powerful. In the first line‚ "Bent double‚ like old beggars under sacks‚" readers can see the weariness of the soldiers‚ trudging tiredly on the war ground. Also‚ by comparing them to beggars‚ the soldiers were probably very dirty after fighting for so long. Think of a soldier staying in a battlefield‚ their uniforms‚ their faces will most likely be covered with dust‚ grime‚ or even blood. In the second line
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