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Why are elements atomic mass not in strict increasing order in the periodic table?
Wiki User
∙ 9y ago
Elements in the Periodic Table are arrange by atomic number (number of protons) because various isotopes of elements exist with different atomic masses (Atomic Mass being determined by the number of neutrons added to the number of protons). The chemical properties are mainly dependent on the electrons, or in some cases the charge of the protons, which is independent of the number of neutrons.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoAtoms are identified and the periodic table is organized by ascending order of the number of protons in the atom. The atomic mass is the average mass of the atom including protons, neutrons, and electrons. The number of typical neutrons can vary and it is possible that successive elements such as Tellurium and Iodine could have the atomic mass reversed. Note, there are often different numbers of neutrons possible in nucleus with the reported mass being the average. For example, Hydrogen, Deuterium and Tritium are essentially chemically identical, with the only difference being the number of neutrons in the nucleus (and Tritium being radioactive).
Wiki User
∙ 13y agoThis was how it was done originally, until it was recognised that atomic number is more important for arranging the elements than atomic mass. Atomic number represents the number of protons in the element, and atomic mass represents the average mass of that element in nature. Atomic mass does increase with atomic number, with some exceptions, and they are 1) Argon has a greater atomic mass than Potassium, but the latter has higher atomic number. 2) Likewise Cobalt and Nickel. 3) Tellerium and Iodine. There are exceptions among the radioactive elements as well.
Wiki User
∙ 12y agoOriginally, they were arranged by weight. But over time, the atomic number system came into play, in which elements were assigned numbers based on the number of protons. keep in mind that the atomic mass on the periodic table is a weighted average of all isotopes. Hope this clears that up.
Wiki User
∙ 10y agoExplain why the elements within a group have similar chemical reactions.
Wiki User
∙ 9y agoThe reason atomic numbers are used instead of atomic masses because of Mendeleev's. These are in the same group.
Wiki User
∙ 9y agoSince certain elements have isotopes. The order of atomic mass can't be in strict order.
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First person to arrange elements in a table?
Dmitri MendeleevIn ancient Greece, Aristotle postulated that there were four elements (fire, water, earth, air) and arranged these accordingly. Later on when science began to theorize (and later prove) the existence of atomic elements without the benefit of knowing the subatomic properties involved, people sorted them in many different ways.In 1829 Döbereiner proposed the Law of Triads: The middle element in the triad had atomic weight that was the average of the other two members.The English chemist John Newlands, noticed in 1865 that when placed in order of increasing atomic weight, elements of similar physical and chemical properties recurred at intervals of eight, which he likened to the octaves of music. As knowledge about subatomic particles increased, this system proved unreliable and fell into disfavor.The modern periodic table of elements which is based on both atomic weights and chemical properties was developed by Dmitri Ivanovich Mendeleev in 1869. Four months later, a German professor Julius Lothar Meyer independently developed a periodic table similar to Mendeleev's.However, Mendeleev plotted a few elements out of strict mass sequence in order to make a better match to the properties of their neighbors in the table, corrected mistakes in the values of several atomic masses, and predicted the existence and properties of a few new elements in the empty cells of his table. Mendeleev was later vindicated by the discovery of the electronic structure of the elements in the late 19th and early 20th century.Mendeleev's periodic table also successfully predicted the future discovery of several elements, and has thus become the de-facto standard for the organization and display of the elements.The person you're looking for is Gregor Mendeleev.
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"s-t-r-i-c-t"
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Yes, very strict.
How can use a sentences strict?
he was very strict about it
