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Who Invented The Periodic Table

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Recommended: State the contribution made by mendeleev towards the periodic table

Elements make up everything on the earth. Many different elements are discovered throughout the years. Elements that have already been discovered are arranged in a model called the periodic table. Dimitri Mendeleev founded the periodic table in 1869. The periodic table tells you many things about an element. It places elements in order relative atomic mass. Mendeleev realized that the characteristics of the elements where according to their atomic weight, so he arranged them so elements with the same properties would be in a column called a column. Column one is the alkali metals. Column two is the alkaline earth metals, Columns three thru twelve are called the transition metals. Column seventeen is the halogens. Lastly, column eighteen is the noble gases. These columns are used to divide …show more content…

This group consist of Lithium, Sodium, Potassium, Rubidium, Cesium, and Francium. These metals are very soft and can usually be cut with a knife. They have a very low melting and boiling point. Densities of these elements are very small, and the electronegativity is low. Alkali metals are the most reactive metals. They react very strongly in the reaction with water. However, a couple of the alkali metals do not react well at all with any other element. For example, francium has the lowest electronegativity, which means that the power of an atom to attract electron density to itself is very unlikely. The alkali metals combine very readily with the halogen group. This is because the alkali metals have one valence electron that they are ready to lose, and the halogens have seven valences electrons. The stable outer shell of a compound is to have eight electrons. The one electron from the alkali metal would give the compound eight valence electrons which is a necessity according to the octet rule. Some compounds that are formed from this group are sodium chloride, potassium hydroxide, sodium hydroxide, and potassium

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4.) I noticed that there is a relationship between the ionic radius and the atomic number of the representative elements in Group 1A. The higher the atomic number, the bigger the ionic radius is. So, while hydrogen has an atomic number of 1 and Francium has an atomic number of 87, it is safe to assume that FR has a higher ionic radius. This is true; the ionic radius for Hydrogen is 0.012, and for Francium, it is 0.194.

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Task 1 (P1) The periodic table is laid out into groups and periods. They are also put into different blocks S-Block, D-Block, P-block and F-Block due to their energy levels. They are organised by their energy levels and chemicals properties. As the elements go along the periods in the periodic table the electronegativity increases but as the elements go down the groups the electronegativity decreases.

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Ancient scientist like Democritus and Leucippus proposed the idea of the atom(Doc.1). They were the first to start the long train of ideas and knowledge that brought us to the view of the modern atom(O.I). Since then, scientist such as John Dalton and Dmitri Mendeleyev have made huge leaps in the field of atomic science. John Dalton published the atomic theory of matter(Doc.1). Dmitri Mendeleev created the periodic table that modern scientist use daily(Doc.1).

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Gregorio Hernandez Mr. Schlinkmann Think and Write The early development of the Periodic Law or table was found by many contributions from a variety of scientists. The contributions led to the discovery and establishment of the Periodic Table. Which help create the Periodic Table we use as of today. The person who created the Periodic Table was a chemist named Dmitri Mendeleev, but not without the help of a few other scientist who helped him get the idea by passing down information they had found. Mendeleev discovered the Periodic Table by trying to organize the elements.

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KCL is an ionic bond. This is because potassium (K) has a charge of +1 and chorine having a charge of -1. K gives one electron to chlorine, this makes it so both of them have a full valence shell. GeCl4 is a covalent bond, due to it being hard to separate its 4 valence electrons so Germanium shares its 4 valance electrons to Chlorine therefore making 5 full outer valence shells. BrCl is a covalent bond.

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The technology Arthur Holmes used set him apart from other scientists, while still being accurate today. Arthur Holmes used uranium-lead radiometric dating to measure the age of rocks, which in turn, led to his accurate estimation of the Earth’s age, and the popularity of radiometric dating. Holmes’ prediction would have resembled predictions of other scientists of the time if he did not use the then remarkable, new technology of uranium-led radiometric dating. Although Holmes was the first to use uranium-lead radiometric dating, he did not invent it. Ernest Rutherford in 1905 created it, and Arthur Holmes was the first to accurately use it in 1911.

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The organization of periods and groups consist of the number of valence electrons. Periods are the rows

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On August 26, 1743 Antoine Laurent Lavoisier was born. Lavoisier is considered to be one of the major fathers of chemistry because of his multiple advancements in chemistry during his life. There were many different instances where Lavoisier furthered the understanding of the scientific community. Throughout his life Lavoisier has helped with establishing a naming system for chemical substances, introduced the Law of Conservation of Mass, concluded that sulfur was an element, discovered that there was “oxygène” in the air that helped with combustion, and many other discoveries. During his lifetime, the French Revolution was taking place.

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He predicted the existence and properties of new elements and pointed out accepted atomic weights that were in error. It was a combination of 26 letters. He wrote the names of 65 elements on card. The elements are in order by atomic weight. Many people didn’t believe in Mendeleyev’s Periodic Table.

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1a. Sodium has a larger radius than lithium because it has a higher principle quantum number and it’s electrons occupy more subshells. Because sodium and lithium are in the same group they both have 1 valence electron, but sodium has its outermost electron at n=3, and lithium’s outermost electron is at n=2, so sodium will have a larger radius despite effective nuclear charge. 1b. Magnesium has a smaller radius than sodium because it’s valence electrons have a stronger net attraction to the nucleus.

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Democritus and Leucippus “invented” the idea of an atom back in fifth century B.C, with the Greek word ατoμoν (atom) meaning “indivisible” as at that time it was believed atoms could not be broken down into slightly smaller pieces. Over the years our ideas of atoms and atomic structure have changed, with Dalton, Thomson, Rutherford and Bohr all having differing opinions on how an atom is put together. “Billiard Ball Model” For instance, John Dalton believed that atoms are the very small things of which everything (all matter) is comprised. Similarly to Democritus and Leucippus he believed dividing or destroying an atom was impossible, yet he was revolutionary in the idea that atoms of the same element were alike, while stating that atoms

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The atomic theory has came a long way since its first development. Having several scientist contribute to the theory creating the atomic theory that we know today. Since its creation by Democritus scientist have contributed to the learning of atoms to develop the atomic theory allowing us to know all that we know today. With several scientist working to create and modify the atomic theory, Democritus is credited with the creation atomic theory, being alive around 460 BC -370 BC, he was the first person to theorize the existence of the atom. Democritus theory stated that the universe and all matter obey certain principles.

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The periodic table is one one science's most known symbols. Do you know who made it? The creator was a chemist named Mendeleev. His dream was to organize chemistry in a better way. Using the Periodic table Mendeleev predicted the existence and properties of new chemical elements.

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They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fashioning. 9. What would happen to a nuclear reactor if the control rods were pulled out and then for some reason could not be pushed back in? Natural super-critical mass of Uranium will not explode on it's own unless it's ...

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Halogens are group 17. Halogens are highly reactive in elemental form. Even though this group only needs one electron in its outer level, it has seven electrons. When halogens are in gas form they are diatomic molecules. Diatomic molecules are two atoms in the same covalent bonds.

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