Elements within the same period or group have similar properties. Some groups have specific names like the halogens or noble gases. Each row of the periodic table is called a period and each column of the periodic table is called a group (or family). Elements are listed in order of increasing atomic number from left to right. For example, an atom of oxygen contains 8 protons. Atomic number describes the number of protons in one atom of that element. The element symbol is almost always accompanied by other information such as atomic number and atomic weight. The atoms are grouped in order of increasing atomic number. The periodic table: The periodic table is a tabular display of all the chemical elements. The symbol for silver is “Ag” from Latin argentum, which means “gray” or “shining.” The symbol for mercury is “Hg” from the Latinized Greek hydrargyrum, which means “water-silver.” Many periodic tables include the full name of element as well and color-code the elements based on their phase at room temperature (solid, liquid, or gas). Two notable exceptions include silver and mercury. Most elements are represented by the first letter or first two letters of their English name, but there are some exceptions. For example, “H” denotes hydrogen, “Li” denotes lithium, and so on. In the typical periodic table, each element is listed by its element symbol and atomic number. The periodic table only lists chemical elements, and it includes each isotope of each element within one cell. The periodic table is structured as an 18 X 7 grid positioned above a smaller double row of elements. period: A horizontal row in the periodic table which signifies the total number of electron shells in an element’s atom.group: A vertical column in the periodic table which signifies the number of valence shell electrons in an element’s atom.atomic number: The number, equal to the number of protons in an atom, that determines its chemical properties.All elements within a certain group thus share similar properties. The vertical columns (groups) of the periodic table are arranged such that all its elements have the same number of valence electrons.The arrangement of the periodic table leads us to visualize certain trends among the atoms.The periodic table lists all the elements with information about their atomic weights, chemical symbols, and atomic numbers.The valency of the compound is 1 and 1.Some formulas through which we can make compounds by knowing the valency of their elements are as follows: Hydrogen Chloride Hence, the valency of vanadium are 2,3,4 and 5.įormulas of Compounds by Valence Electrons.Its electronic configuration is Ar 3d 3 4s 2.It is a transition element and most of these show variable valences.It will gain 3 more electrons to complete its octet.Its electronic configuration is 2, 8, 5.It shows two valences: 1 (or Cu(I)), known as cuprous, and 2 (or Cu(II)), known as Cupric.It is a transition element, and most of these elements have variable valences.The outermost shell is already filled, so it will not lose electrons.Sodium will lose 1 electron to complete its octet.Its electronic configuration is 2, 8, 1.Here are the formulas of Valence Electrons for some elements: Sodium Read More: Polytetrafluoroethene (Teflon) The periodic table of all the elements is mentioned below: If there are 8 electrons in the outermost shell, it means that the octet is completed already, and there is no need to lose or gain electrons.If there are 4 electrons in the outermost shell, it can lose or gain 4 electrons to complete its octet.If there are 5, 6, or 7 electrons in the outermost shell, it will gain some electrons to complete its octet.If there are 1, 2, or 3 electrons in the outermost shell, it will lose these electrons to complete its octet. Another way to calculate the valence electron is by determining the electronic configuration of an element.įor Electronic configuration, we have to check the outermost shell of an electron in the following ways:.With the help of group numbers, we can easily calculate the number of valence electrons of an element.Valence electrons can be determined by checking the vertical column of the periodic table.The structure of these elements could be much better. The electrons of these groups can be determined easily, but they are difficult to predict. It can be found in all elements, even if they are from Group 3 to Group 12. Valence electrons can easily be determined with the help of the periodic table.
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