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Profile Hi! I'm Clarence!I like sleeping and playing computer and stuff like that. I like playing soccer on the xbox and in real life, although i don't get that many chances to play. I love movies. Especially horror movies or comedy. |
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Profile Hi! I'm Clarence!I like sleeping and playing computer and stuff like that. I like playing soccer on the xbox and in real life, although i don't get that many chances to play. I love movies. Especially horror movies or comedy. |
Music |
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Sunday, 3 July 2011
Chemistry 1. What does an atom looks like? What are the sub-atomic particles inside it.....(talk about electrons, neutrons, protons, electron shells, nucleus....) An atom consist of 3 different particles- protons, neutrons and electrons. These are smaller then the atoms. they are called sub-atomic particles.Protons are positive (+1 charge) with a relative mass of 1, neutrons are neutral,which means that it has no electric charges. It also has a relative mass of 1 while electrons are negative (-1 charge) with a relative mass of roughly 1/1840. 2. Draw the atomic structure of a sodium atom and a sodium ion....explain why you draw it this way.  For the sodium atom which has electronic structure of (2.8.1) it has to lose 1 electron to become stable..By losing 1 electron,it becomes a sodium ion with an electronic structure of (2.8). Picture from Chun Boon of 3E5 3. Draw the atomic structure of a sulfur atom and a sulfide ion....explain why you draw it this way.  For the sulfur atom which has electronic structure of (2.8.6) it has to gains 2 electron to become stable..By gaining 2 electrons,it becomes a sulfide ion with an electronic structure of (2.8.8). Picture taken form Wendy of 3E5 4. Chlorine-35 atom and Chlorine-37 atom are called isotopes...Use these two examples to explain what is 'isotopes'. Isotopes are atoms of the same element with the same number of protons but differents number of neutrons. Chlorine-35 has 35 as its nucleon number. So it has 17 protons with 18 neutrons. Chlorine-37 has 37 as its nucleon number. So it has 17 protons with 20 neutrons. So they are isotopes as they have the same proton number but different nucleon numbers. 5. Sodium is a metal and sulfur is a non-metal....why we classify them this way? Metals are from group I, II, III and from transition metals which are between group I and group II. Non-metals are from group IV, V ,VI and group 0 Sodium is from group I, it will achieve the electronic structure of the noble gas if they lose one electron, in which it would become a sodium ion. Sulfur is from group VI, it will achieve the electronic structure of the noble gas if it gains two electron, so it would become a sulfur ion. 22:31
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Affiliates Aaron Agnes Aleen CekMin Charmaine Chelsea Chun Boon Cindy Clarence EiEi Fabian Grace Helmi HweeLeng Janis JiaLe JieEn JunJie JunWei KaiQi Michelle MingSiew Nicole Rupini ShinYoong ShuYu SiukGeok Su WanLing Wendy XinHui XinKang XueLi XueTing Yihui YiJin YiTing Ysabelle Zane ZeWei Ziqing |