Periodic Table of Elements with Valence Electrons Trends. 18 electrons Electrons in the outer shells that are not filled are called valence electrons. What is shown here is only the Valence electrons. The below is the image for the valence shell of chlorine which converts into chloride ion. The atomic number of Cl is 17 and its simple electron arrangement is 2, 8, 7 …The region containing 7 electrons is called valence shell and remaining 10 electrons constitute core electrons…Thus Cl has core of Ne… Step-3: The group valence of the elements is generally either equal to the number of dots in Lewis symbols or 8 minus the number of dots or valence electrons. The first valence shell contains 2 electrons, and the second and third shell have 8 electrons each, and the number keeps growing. Cl is 17 and it's electronic configuration is 2,8,7. The general formula is that the nth shell can in principle hold up to 2(n 2) electrons. Initially there are 7 as with the case with all the members of Halogen group. Hence it has 2 electrons in its inner-most shell, 8 electrons in its second shell and 7 electrons in outer-most shell respectively. Answer: Each chlorine has 7 valence electrons. The atomic number of chlorine is 17. Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. How many electrons are in Cl ion? We know that the atomic number of chlorine is 17.So chlorine has 17 protons and 17 electrons as the charge of electrons and protons are equal but opposite in nature.The charge of proton is +1 and the charge of electron is -1. An atom such as chlorine (Cl), that contains seven electrons in its valence shell, needs one more electron to have a full valence shell. Hence, it's valency is -1. For facts, physical properties, chemical properties, structure and atomic properties of the specific element, click on the element symbol in the below periodic table. The atomic number of chlorine is 17. Valence electrons. Step-by-step explanation: Chlorine is an element with atomic number 17 and thus contains 17 electrons.Valence electrons are the electrons which are present in the valence shell. A. Lewis dot structure for an atom of chlorine is . In the below periodic table you can see the trend of Valence Electrons. The Atomic number of chlorine I.e. If we use the same logic as we did for sodium, we should conclude that chlorine would rather gain one more electron than lose all seven of its valence electrons … Chlorine’s electron configuration is 2-8-7; therefore it has seven valence electrons and needs to have seven dots drawn around its symbol. 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