Atomic number Essays

General Periodic Table: 1. State the periodic law in your own words. Chemical and physical properties of elements repeat in each period when elements are arranged in order of atomic mass 2. How do the properties analyzed in this activity show periodicity of the chemical elements? That is, as the atomic number increases, when do the trends repeat? For the most part, the trend carried out throughout the period. However there were some cases when Argon, a noble gas did not follow a trend and

each element has a characteristic atomic weight for each element. Mendeleev 1st table During his time elements were distinguished by only one basic property, which had been proposed by John Dalton an English chemist and physicist. Dalton was best known for his work in the development of modern atomic theory. The was Dmitri organized the table was that he wrote out the elements on a card, each card has the atomic weights and were set in columns by order of the atomic weight. Each

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

of increasing atomic weight the next certain types of elements regularly occurred. The other person that helped develop the Periodic Table was Antoine

places were in his table. These were also elements yet to be discovered. In the periodic table, each element has its own atomic mass and number. Atomic mass is the total amount of protons and neutrons in an element, atomic mass is usually larger than the atomic number. Atomic number means how many protons the element contains. All atoms of a particular element have the same atomic

Then there are two letters which is the element symbol in the middle of the box, usually the element name is under the two letters. I need the very bottom of the box is the mass number, the mass number is the number of protons and neutrons in nucleus. Every element in the top row besides the hydrogen and helium element, has one orbital for its electrons. then the second row two orbitals, and the third row has three orbitals, and so on and so forth

way that facilitates the predictions of many of the properties and chemical reactions. The periodic table is an arrangement of chemical elements ordered by their atomic number, electron configuration and rate of activity. Elements are constructed in seven horizontal rows called periods, that are arranged in increasing atomic number further along the

by increasing atomic number. As atomic numbers increases, so does the number of electrons. Electrons, and specifically valence electrons, are important in determining how an atom interacts with other atoms. The elements in a vertical “group” have similar properties because they have the same number of valence electrons and similar electron configurations. Thus this leads to smoothly varying trends in properties such as ionization energy, electronegativity, ionization energy, and atomic radius as one

factors. All elements in the table display a periodic trend. Electron configuration and properties also affect the periodic table. The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding cloud of electrons. The periodic table depicts atomic radius by configuring them from smallest to largest as you move down the table. Ionic radius is the radius of an atom's ion. Although

But what separates Isotopes from elements is the fact that they have the same number of protons as an electron but have a different number of neutrons. As the atomic number is the mass is the number of protons and the atomic mass is the weight of protons and neutrons we can therefore say they have the same atomic number as an element but have different mass numbers. For example Aericium 241 is an isotope we se used in evry day common objects such

Metallic chemical element chemically active, soft white color, symbol Cs, is located in the first group of the periodic table which means that he belongs to a group of alkaline elements. Atomic number 55 and atomic weight 132.905, the melting point of 28.4 degrees Celsius and a boiling point of 671 degrees Celsius and density of 1.87 g / cm 3. Cesium was discovered in 1860 by the German chemist Robert Bunsen, German physicist Gustav Kirchoff during the use of the spectroscope when they analyzed the

There are 117 scientific elements of the periodic table. Each have their own very distinct identities. They were all discovered by different people, at different times, and in different locations. Each element also has specific properties that only identify that particular element. They all have their own specific uses, but some can be combined to make for a stronger alloy or mixture. Silver is no different from every other element in its uniqueness. The element of silver was discovered and named

similarly to those of alike atomic weights. This discovery lead to the masses of scientists trying to find a pattern within the reactions and properties in order to efficiently find an order to put the elements in. The periodic table was previously known as Mendeleev's table. It was named after the scientist Dmitri Mendeleev, of whom came up with the original idea of putting the sixty three known elements in the 1860s into a table. While organising it in order of ascending atomic masses (weights as they

periodic table. We set up the periodic table and we then organized five different trends of the elements. We ordered them by their Atomic Radius, Melting Point, Electronegativity, Electron Affinity, and 1st Ionization Energy. In doing so, we were able to understand just why the periodic table is how it is today, and that it is not just the different elements ordered by atomic number, there is way more to it than just that. Activity

Plutonium-239 are used in atomic bombs. However, what are isotopes? Isotopes are atoms with the same number of protons but have a different number of neutrons. Hence, we can say that isotopes are same elements with the same atomic number but different mass number. Out of the 118 elements that have been discovered, only uranium and plutonium are used to make atomic bombs. As if that was not specific enough, only a certain isotope from these two elements were used in the making of atomic bombs, Uranium-235

as probes to the unseen parts of atomic structure. Rutherford's experiment shows how scientists must never just accept the current theories and models but they should always be putting to new tests and experiments to the test. Rutherford was defiantly one of the most successful scientists of his time although his most renowned

it came to be, and what it can do. Plutonium is in the transitional metals section of the periodic table. Plutonium has the atomic number 94 and a molar mass of 244, which implies that it has 94 protons, 94 electrons, and 150 neutrons ("It 's Elemental."). You can tell how many protons and electrons there are by the atomic number of the element since it is the same number. A person can also tell how many

absorbing elements on the periodic table. There is only one other known element that has an absorbency which is xenon -135 an unstable element. The Atomic number of the element is 64, 157.25 g.mol -1 is the atomic mass of this element. The melting point of 1313 °C and the boiling point is 3266 °C. The density per cubic meter is 7.8 grams. The number of isotopes in the element Gadolinium is 13. The element in its natural form is a shiny, ductile, malleable, soft and silver element. The element is

Ytterbium is a rare earth metal, one of the elements found in Row 6 of the periodic table. It has an atomic number of 70, an atomic mass of 173.04, and a chemical symbol of Yb. Ytterbium is a typical metal that is both ductile and malleable. It has a melting point of 1,515°F (824°C), a boiling point of 2,600°F (1,427°C), and a density of 7.01 grams per cubic centimeter. Ytterbium is a relatively reactive element that is usually stored in sealed containers to prevent its reacting with oxygen of the

periodic table, a person can find out how many electrons the element has and how much it weighs. Each element also has its own separate set of such data; no two elements are the same. Thus, if someone is uncertain what matter he has, he can look at the atomic structure of the material, compare it to the information in the periodic table, and identify the material by matching it to the element on the table with the same data. What trends are evident in the Periodic Table? They are many different trends