On the periodic table, elements that have similar properties are in the same groups (vertical). There is a lot of cool stuff about Antimony that people simply dont know. In the case of Antimony the period number is 5. © IUPAC (International Union of Pure and Applied Chemistry).\( \newcommand\): Courtesy of Wikipedia for releasing this image into the public domain Any decent periodic table should have the period numbers when you scroll left starting from the element you found. Source: Adapted from Pure and Applied Chemistry 78, no. R Range in isotopic composition of normal terrestrial material prevents a more precise Ar(E) being given the tabulated Ar(E) value and uncertainty should be applicable to normal material. Substantial deviations in the atomic mass of the element from that given in the table can occur. M Modified isotopic compositions may be found in commercially available material because it has been subjected to an undisclosed or inadvertent isotopic fractionation. The difference between the atomic mass of the element in such specimens and that given in the table may exceed the stated uncertainty. G Geological specimens are known in which the element has an isotopic composition outside the limits for normal material. Isotopes Atoms of the same element with different numbers of neutrons. Where more than one isotope exists, the value given is the abundance weighted average. This is approximately the sum of the number of protons and neutrons in the nucleus. †Commercially available Li materials have atomic weights that range between 6.939 and 6.996 if a more accurate value is required, it must be determined for the specific material. Relative atomic mass The mass of an atom relative to that of carbon-12. However, three such elements (Th, Pa, and U) have a characteristic terrestrial isotopic composition, and for these an atomic mass is tabulated. Table A.1 The Basics of the Elements of the Periodic Table Name For example, see PTable and the Accessible Syngenta Periodic Table of Elements. Forms a large number of organometallic compounds. belongs to group 14 of the periodic table. Lowest boiling point of all elements and can only be solidified under pressure. Belongs to group 18 of the periodic table. The web offers many interactive periodic table resources. Atomic Number: 51: Block: p: Group: 15: Period: 5: Series: Metalloids: CAS: : Mass: 99.999999999: Mass 121. Some elements, such as lithium, can have varying atomic masses depending on how their isotopes are isolated. The atomic masses of other elements, especially radioactive elements, are not known as precisely. The atomic masses of some elements are known very precisely, to a large number of decimal places. The atomic masses in Table A.1 “The Basics of the Elements of the Periodic Table” represent the number of decimal places recognized by the International Union of Pure and Applied Chemistry, the worldwide body that develops standards for chemistry. However, some applications (especially nuclear chemistry see Chapter 15 “Nuclear Chemistry”) require more decimal places. For many applications, only one or two decimal places are necessary for the atomic mass. One item on most periodic tables is the atomic mass of each element. What follows here is a more complex version of the periodic table than what was presented in the chapter “Atoms, Molecules, and Ions.” The internet is a great place to find periodic tables that contain additional information. Periodic tables are available with a variety of chemical and physical properties listed in each element’s box. Many of the physical and chemical properties of the elements are either known or understood based on their positions on the periodic table. An elements position on the Periodic Table tells us whether it is a metal, a non-metal or a semi-metal. The periodic table is arguably the best tool in all of science no other branch of science can summarize its fundamental constituents in such a concise and useful way. The elements are arranged in order of increasing atomic number, with the lightest element (hydrogen: H) in the top left hand corner. The periodic table, introduced in Chapter 3 “Atoms, Molecules, and Ions,” lists all the known chemical elements, arranged by atomic number (that is, the number of protons in the nucleus). In this appendix, we present some data on the chemical elements. Appendix A: Periodic Table of the Elements
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