examples are the four seasons throughout a year‚ products in a grocery store‚ and the desks in your classroom. Henry Mosley recognized a pattern in the elements and arranged them so that they formed the Periodic Table we use today. Writing Directions Write an essay explaining how the Periodic Table is organized. Be sure to include the terms atomic number‚ atomic mass‚ families‚ and periods in the explanation 5. Objects composed of just one element can be bought from Wal-Mart‚ a hardware store
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question number(s). Do not write in the bar codes. INFORMATION FOR CANDIDATES • • • • • The number of marks is given in brackets [ ] at the end of each question or part question. A list of physics equations is printed on page two. The Periodic Table is printed on the back page. The total number of marks for this paper is 60. This document consists of 24 pages. Any blank pages are indicated. © OCR 2012 [Y/103/4259] DC (NF/CGW) 44052/5 OCR is an exempt Charity Turn over 2 EQUATIONS
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Francium is not a very useful outside of the science community. Even though francium is not very interesting i don’t know how but i made 7 paragraph of it. So hope you enjoy the essay... The element francium has a lot of physical properties. Like francium atomic number is 87. Francium’s atom is (233)g.m ol and its destiny is unknown. Its melting point 27 celsius and its boiling point is 677 celsius. Francium is also very reactive to flame retardant. The element francium is
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* The halogens can be found on the left-hand side of the noble gases. * These five toxic‚ non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F)‚ chlorine (Cl)‚ bromine (Br)‚ iodine (I)‚ and astatine (At). * Although astatine is radioactive and only has short-lived isotopes‚ it behaves similar to iodine and is often included in the halogen group. * Since the halogen elements have seven valence electrons‚ they only require one additional electron to form
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ALKALINE EARTH METALS what are alkaline earth metals? Alkaline earth metals are elements that are in the second group of the periodic table. the elements have two electrons on the outermost shell. the elements include Beryllium‚ magnesseum‚ calcium‚strontium‚ barium and Radium.The alkaline earth metals are all silvercolored and soft‚ and have relatively low densities‚ melting points‚ and boiling points. In chemical terms‚ all of the alkaline metals react with the halogens to form the alkaline earth metal halides
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Unit 2 Review: Atomic Structure‚ Nuclear chemistry‚ Quantum Theory‚ Periodic Table Basic Atomic Structure 1. Complete the following chart. 2. Atomic mass is a decimal. Why? It is a weighted average of all naturally occurring isotopes. 3. Define Isotope. The same element‚ different number of neutrons‚ therefore a different mass. 4. Positively charged ions are formed when atom _loses_ (lose‚ gain) electrons. 5. Calculate the atomic mass of the following sample of Silicon. 92.21 % 28Si‚ 4.70% 29Si
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restaurants. I’m going to tell you about neon’s uses‚ history‚ and facts. The largest use for Neon is in advertising signs. Neon is also used to make high voltage indicators. I’m going to give you the chemical breakdown of neon. Neon is on the periodic table‚ its atomic number is 10‚ protons‚ electrons are 10‚ 10 neutrons and its symbol is Ne. Neon is a noble gas. The period of neon is 2‚ and the group is 18. Neon is very rare on earth even though it’s very common element in the universe. In the
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the study of: 1. OUR USE of METALS 2. CHEMICAL ACTIVITY of the METALS 3. PATTERNS of the PERIODIC TABLE 4. QUANTITY CALCULATIONS... the MOLE 5. METALS from their ORES ...all in the context of how Chemistry contributes to cultural development but first‚ an introduction... Chemistry of the Metals Technology Needs Metals In the previous topic you learnt about the Elements of the Periodic Table. In this topic you will concentrate on the chemistry of the metals‚ and some of the chemical
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Ruthenium is the 44th element on the periodic table of the elements. Ruthenium was named after the Latin name for Russia‚ Ruthenia. It is a very rare‚ silvery‚ and shiny transition metal found in South America‚ North America‚ and South Africa. Ruthenium was found in 1844 by Karl Karlovich Klaus. In 1808‚ a Polish chemist named Jedrzej Sniadecki found an element he called vestium in platinum ores from South America. When French chemists tried to repeat his work‚ however‚ they did not find it in the
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are the ones on the outermost shell. All atoms either want to get rid of these electrons or gain enough to make a full shell. Metals‚ which are on the right side of the periodic table‚ have less than 4 valence electrons. This means they want to get rid of those electrons. Nonmetals‚ which are on the left side of the periodic table‚ have more than 4 valence electrons. These atoms want to gain electrons until they have 8‚ which is a full shell. Metals will always be positive because they are giving
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