Ionization Energy - energy required to remove an electron increases moving left to right decreases moving top to bottom Electron Affinity - ability to accept an electron alkaline earth elements have low electron affinities halogens have high electron affinities noble gases have electron affinities near zero other element groups tend to have low electron affinities Electronegativity - measure of the attraction to form a chemical bond increases moving left to right decreases moving top to bottom
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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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The Atomic Mass of Metallo You may have noticed on the periodic table that the atomic mass of an element is usually not a whole number. That happens because of isotopes. An atom that is missing a neutron or has an extra neutron is called an isotope. They are still the same element; however‚ they are just a little different from every other atom of the same element. Most of the carbon atoms in the universe are Carbon-12‚ with 6 neutrons. A small percentage of carbon atoms are Carbon-13‚ with 7 neutrons
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acknowledged of the existence of elements‚ but only knew of common ones like gold‚ tin‚ and copper. It wasn’t until the middle of the nineteenth century when about 50 elements were discovered and scientists began to wonder if the elements vary from each other or if a pattern is represented in the arrangement of the elements. A number of scientists tried different kinds of patterns. For example‚ the German scientist Johann Wolfgang Döbereiner tried grouping the three halogens elements (chlorine‚ bromine‚ and
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contain a periodic table of the elements. It required the immense research and determination of the scientist Dmitri Mendeleev to show us that all elements followed a natural form and provided us with the first decent periodic table. There are 111 elements recognised today by IUPAC and they are arranged in the periodic table in horizontal groups and vertical periods. The eight groups consist of the alkali metals‚ the alkaline earth metals‚ the transition elements‚ metalloids‚ non-metals‚ the halogens
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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 a full octet
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food in this country immensely. They have allowed farmers to have a higher yield of food per acre despite some deteriorating soil conditions. There are three main elements in each bag of fertilizer. They are nitrogen‚ phosphorus and potassium and are represented on the outside of the bag in that order. Each of the three elements has a different benefit to the growth of a plant. Plants use nitrogen to digest proteins‚ nucleic acids and hormones. When a plant is lacking in nitrogen‚ it may have
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elixir of immortality and living forever. Aristotle was another Greek philosopher who had a completely different theory than the one with the atoms. He though that all matters are made up of four elements and they are: Air‚ Fire‚ Water and Earth. By physically manipulating the proportions of the elements‚ matter can be changed from one to another. This idea was known as transmutation‚ and the main goal of it is to transfer ordinary metal into gold. Aristotle did not have a proof for his theory However
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Associate Program Material Levels of Life Worksheet Complete all three parts of this worksheet. Part I: Atomic Structure – Fill in the missing information on atomic structure and organic compounds. Atomic Structure Subatomic Particle Charge Location in an Atom Proton Positive Nucleus Neutron Neutral Nucleus Electron Negative Spherical (outer-shell) Organic Compounds Large Biological Molecule Atoms it Contains Monomer(s) Function(s) in Living Organisms Carbohydrates
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with other substances it will be different and this is because it will not react the same the whole time. The other thing is that this elements electron configuration is 11 which is quite low when comparing them to the other elements in the periodic table. However this metal is more reactive than lithium which is a good thing because it is quite strong. This element has three main energy levels and the outer shell only has one election and this is higher than lithium however potassium is stronger
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