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2 pages/β‰ˆ550 words
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APA
Subject:
Life Sciences
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Essay
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English (U.S.)
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Topic:

The Periodic Nature and Properties of Atoms and Molecules

Essay Instructions:

Prepare a 350- to 700-word paper in which you describe the periodic nature and properties of atoms and molecules.
Explain at a level of detail Dmitri Mendeleev would have understood how halogens and alkali metals are extremely reactive, whereas noble gases are not reactive.
Compare properties of molecules formed from atoms in similar families; for example, H2S versus H2O.
Explain what is meant by the electronic structure of atoms. How does knowing the electronic structure of atoms aid chemists in predicting chemical reactions?
Format your paper consistent with APA guidelines.
Click the Assignment Files tab to submit your assignment.
Please format your paper to be consistent with APA guidelines. You MUST include a Reference section at the end of the paper for the best grade. You will be docked points off for not including a reference section. Please go to the Center for Writing Excellence to learn how to reference your information sources that are used in the paper.
For instance, you may need to cite the class textbook as one of your source of information. In which case, add this to the end of your paper: (Note that you need page numbers when referencing a book or journal.)
Example: Reference: Tro, N. J. (2009). Introductory chemistry. (3rd ed.). Upper Saddle River, NJ: Pearson/Prentice Hall. p.11-13.
Please note - in the body of your essay, you must also provide the intext citations. Basically, this tells the reader where (in your paper) that you used the references that you listed in the Reference Section.
**Please note that many chemical formulas use subscripts and superscripts. There are buttons on Microsoft Word toolbar that you should learn to use. They are the subscript and superscript buttons. Remember, the "2" in H2O is subscripted. Those buttons usually must be added to your toolbar in Microsoft Word..
Please run your paper through a spelling/grammar checker. The Center for Writing Excellence has a program called WriterPoint. It can recommend changes if it observes spelling errors and grammar errors. Or you can also click the "Review" tab in Microsoft Office Word. Under that section, it has a button called "Spelling/Grammar" checker. It's not very good. But, it can definitely improve your paper.

Essay Sample Content Preview:
Chemistry: Periodic nature and properties of atoms and molecules.
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Chemistry: Periodic nature and properties of atoms and molecules.
1.0 Periodic nature and properties of atoms and molecules
Since ancient Greek, scientists have been making continuous efforts to understand the true nature of mater. One of the most important achievement that has been made is the periodic table which not only organizes known information, but also enable scientists to predict unknown properties (Hinchlife, 2011, p.14). Elements in the periodic table are arranged according to their atomic structure which is in a systematic increasing number of atoms. The elements display other characteristics and trends that distinguish them from others which is their chemical, physical and atomic properties (Scerri, 2011, p.12). These trends are well understood by analyzing the elements of electronic configurations. This according to Lagerkvist (2012) is what is referred to as the periodicity of atoms and molecules.
2.0 Reactivity of elements as per Medvedev's understanding
Halogens and alkali metals are highly reactive. These group 1 elements of the periodic table which include Lithium, Sodium, Rubidium, Cesium and Francium, while halogens include Flourine, chlorine, Bromine and Iodine. When they react a reaction that combines a metal and a nonmetal happens creating ionic compounds. Alkali metals have a +1 charge and have a large atom size than other elements. This size is determined by the atomic radius of the atoms which is the distance between two nuclei of two identical atoms. By losing the electron the alkali metal gets a stable electronic configuration (Scerri, 2011, p.133). These change is also referred to as electron affinity whereby an electron is added to a gaseous atom. The electron is easy to be lost as the size of the atom increases increasing the distance of the electron from the nucleus. The reaso...
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