The periodic table of elements, by far, stands among the most notable discoveries in the history of chemistry. Nowadays, probably everyone who has ever heard about chemistry heard about the periodic table of elements. Its implications on the scientific world are so enormous that it has even leaked out to the general public and have become associated with the chemistry itself. This is not surprising considering the scientific strength of this instrument. Using the periodic table, many characteristic properties of the elements can be predicted and many phenomena can be explained. This discovery put so much scientific knowledge together, ...
Essays on Electronegativity
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Chapter 3 Atoms and the Periodic Table
For centuries, many have tried to learn about the smallest particle. As far as 2500 years ago, Democritus and Leucippus created an idea for the atom and called it ‘atmos’ meaning indivisible. Various philosophers and scientists have proposed models for what and how the atom should be. The initial theory proposed by Dalton in 1803 states that atoms are indivisible and that all atoms of a particular material are identical. He also stated that atoms of different materials join to form compounds. J.J. Thompson proposed the initial model of the atom. It is called the plum pudding model. He theorized ...
1- The chapter opens with these words: “ Neeru, shouei, maima, aqua. In any language, water is the most abundant compound on the surface of the Earth.” - Explain the term compound and also why water is not an element. Answer: Compound is a chemical entity made from combination of two or more different elements. These elements lose their individual identities when they combine to form a compound and possess unique properties subjected to that compound. Water is made from two molecules of hydrogen and one molecule of oxygen. Hydrogen and oxygen individually are elements but when combined in the ...
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ORDER AN ESSAYCompounds And Mixtures
Compounds and Mixtures differ both physically as well as chemically. While
Compounds are pure substances, mixtures are impure. Compounds are formed of two or
more elements combined chemically, on the other hand mixtures are formed by mixing two
or more substances physically only. The ratio of constituents or elements in a compound is
fixed while in mixtures substances can be and are available in varying ratios. While the
constituents of a compound can only be separated by complex chemical methods, easy
physical methods do the trick in Mixtures.
Elements are substances that are impossible to be divided while Compounds
are substances ...
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