![]() Thus, the symbol of element sodium is $ Na $. Sodium is a common name and the chemical name is Natrium. It is also one of the densest elements, following only platinum, iridium and osmium and it is one of the highest melting point elements exceeded only by tungsten and carbon. It is one of the rarest elements on the Earth with an abundance of something like 1 part per million. Some chemical elements have chemical names and common names. Rhenium is element 75 in the periodic table and in many ways a rather unusual element. The molar mass of the element is $ 7 $ as there were three protons and four neutrons in the commonly occurring isotope.Ĭhemical symbol is a short representation of chemical elements. As the electrons will be easily lost from the element. It is an electropositive element in the periodic table. Lithium is a chemical element with atomic number $ 3 $ and belongs to the $ $ group. Under standard conditions, it is the least dense metal and the least dense solid element. It is a soft, silvery-white alkali metal. The elements in alkali earth metals are hydrogen, lithium, sodium, potassium, rubidium and caesium. Lithium (from Ancient Greek (lthos) 'stone') is a chemical element with the symbol Li and atomic number 3. These are metals as they can easily lose electrons. ![]() The elements in the group $ 1 $ are known as alkali earth metals. There are a total of $ 118 $ elements in $ 7 $ periods and $ 18 $ groups. The vertical columns were known as groups and the horizontal rows were known as periods. These elements are arranged in the vertical columns and horizontal rows. A chemical element, often simply called an element, is a type of atom which has the same number of protons in its atomic nucleus (i.e., the same atomic number, or Z ). Lithium (pronounced as LITH-ee-em) is a soft metal with a silver appearance, represented by the chemical symbol Li. 1, selenium lies above and to the right of the diagonal line marking the boundary between metals and nonmetals, so. Solution: The atomic number of selenium is 34, which places it in period 4 and group 16. ![]() 1 and then classify the element according to its location. ![]() Modern periodic table is the representation of chemical elements arranged in the increasing order of atomic numbers. This is a list of the 118 chemical elements that have been identified as of 2023. Strategy: Find selenium in the periodic table shown in Figure 2.5. The first group elements are alkaline earth metals the second element in the first group is lithium has the chemical symbol of Li.Ĭhemical elements are the purest form of atoms. These elements are arranged in groups and periods. Hint: Periodic table consists of different elements arranged in the increasing order of atomic numbers. ![]()
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