![]() Stability is attained either by losing or gaining or sharing of electrons. The main reason for the stability of the noble gas elements is the completely filled orbits of the atom.Įach and every element in the periodic table wants to attain the stability of noble gas as they are the most stable element in the periodic table. As all the orbits of an atom are filled, the new electrons, if added, need a new orbit. ![]() These are at the rightmost column of the periodic table. These are named as the Noble Gas family or the inert gas. If every orbit in the atom is completely filled with its maximum number of electrons that it can hold then such atoms are the most stable elements. The group number defines the valence electrons present in the element. The period number represents the number of shells in an atom. (Recall that the number of valence electrons is indicated by the position of the element in the periodic table.) If the species is a polyatomic ion, remember to add or subtract the number of electrons necessary to give the total charge on the ion. Hence, the formula of Compound Carbon Tetrachloride is CCl 4.The alkaline metals, the second group of the table, contains two valence electrons, i.e., the outermost orbit of this atom contains two electrons. Add together the valence electrons from each atom. The formula of Carbon Tetrachloride can be produced by using the valency of these elements. Try our Interactive Periodic Table of Elements that lets you sort by metals, physical states, group, and period, and view the most important elemental. Ques: What is the chemical formula of the compound Carbon Tetrachloride?Īns. Hence, Mass Number = Number of protons + Number of neutrons = 12+12 = 24. Hence, sodium can form Na + ions, magnesium can form. Ques: What is the atomic number and mass number of Magnesium if it has 12 protons and 12 neutrons?Īns. It is a general rule that for elements on the left in the periodic table, which have one, two, or three electrons in their valence shells, sufficient energy is attainable in chemical reactions for their removal, but not enough energy is available for removing any electrons from inner shells. They have to complete its octet by bonding with another element. Most elements do not have full electron shells so that they can bond with other elements. Ques: Why do most elements not have full electron shells?Īns. A neutral aluminum atom will have the following electronic configuration in its ground state: 2,8,3 The Proton number of Aluminum is 13 which means its atomic number is 13 and it has 13 elements. What will be its electron configuration?Īns. You can effortlessly find every single detail about the elements from this single Interactive Periodic table. Free Gift for you: Interactive Periodic Table Let me tell you how this Interactive Periodic Table will help you in your studies. Ques: Aluminum has a proton number of 13. Protons, neutrons and electrons of all elements are mentioned in the table below. Electronic Configuration is 2, 8, 18, 18, 5.The element having atomic number 51 is Antimony(Sb). Ques: How can we find the valency of an element with atomic number 51?Īns. Hence, the formula of the compound is MgCl 2 Hence, the formula of the compound is (NH 4) 2SO 4 Hence, the formula of the compound is H 2S Hence, the formula of the Compound is HCl Some Formulas through which we can make compounds by knowing the valency of their elements are as follows: For the large majority of the elements on periodic table, valence electrons can be found rather easily by simply identifying its location on the table. It is a transition element and most of these show variable valences.įormulas of compounds by Valence Electrons It will gain 3 more electrons to complete its octet. 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 show variable valences. Electrons in the inner shell are well-protected and are not involved in. These are electrons that can participate in the formation of a chemical bond. The outermost shell is already fulfilled. The outermost shell also contains some electrons which are known as valence electrons. Valence electrons are the outer-shell electrons of an atom. ![]() It will lose 1 electron to complete its octet. Here are some formulas of Valence Electrons of some elements: Read More: Polytetrafluoroethene (Teflon)
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