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Initially there are 7 as with the case with all the members of Halogen group. How many electrons are in Cl ion? The atomic number of chlorine is 17. The number of valence electrons for an atom is the number of electrons in the outer energy level (shell) of the atom. What is shown here is only the Valence electrons. In the below periodic table you can see the trend of Valence Electrons. The Atomic number of chlorine I.e. Electrons in the outer shells that are not filled are called 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. 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. Since it has 7 valence electrons in it's outermost shell and it needs one electron to complete it's octet. Hence, it's valency is -1. The below is the image for the valence shell of chlorine which converts into chloride ion. The general formula is that the nth shell can in principle hold up to 2(n 2) electrons. 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… Periodic Table of Elements with Valence Electrons Trends. Step-3: The atomic number of chlorine is 17. 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. 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. 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. When a sodium atom transfers an electron to a chlorine atom, forming a sodium cation (Na +) and a chloride anion (Cl-), both ions have complete valence shells, and are energetically more stable. In contrast, chlorine and sodium have seven and one electrons in their.A Bohr diagram depicts an atom with a small, central nucleus and the electrons in their valence shells. An atom such as chlorine (Cl), that contains seven electrons in its valence shell, needs one more electron to have a full valence shell. Chlorine’s electron configuration is 2-8-7; therefore it has seven valence electrons and needs to have seven dots drawn around its symbol. 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. 18 electrons Valence electrons. For facts, physical properties, chemical properties, structure and atomic properties of the specific element, click on the element symbol in the below periodic table. A. Lewis dot structure for an atom of chlorine is . 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 … Electrons each, and the number keeps growing an atom is the image for the valence shell of chlorine.. Formula is that the nth shell can in principle hold up to 2 ( n 2 ) electrons shell it. Needs one electron to complete it 's outermost shell and it needs electron. Hence it has seven valence electrons third shell have 8 electrons each, and the number keeps.. 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