This means that chlorine has 7 electrons in its valence shell of electrons. If I want to figure out how many valence electrons chlorine has, I have to look for the electrons in the outermost shell, or the outermost energy level. Chlorine has 17 electrons; therefore, the first ring is filled with two electrons, the second ring is filled with eight electrons, but there are only seven electrons for the third ring. Most atoms found in sodium and and chlorine do not always have a completely filled valence shells. C = 4. An atom, which is the fundamental unit of an element, contains an equal number of electrons and protons. Chlorine is an element that belongs to Group7A in the periodic table. Cl = 7 x 3. 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… So I have, once again, the first energy level, the second energy level, and the third energy level. H = 1----- 26 electrons. The 7 electrons that are found in the valence shell are the electrons used to bond with the other atoms. how many core electrons does chlorine have, Moreover, the electrons used to form bonds with the other atoms is called the valence electrons. This makes chlorine's valence shell incomplete, and the atom attracts "loose" electrons to this shell to complete it, so the atom can be stable. That's a total of 33 valence electrons. Which property of covalent compounds is most useful in making backpacks? The four P-Cl bonds use 8 electrons. 4 (Four) Nylon is a "big" covalent molecule used to make backpacks. If I want to figure out how many valence electrons chlorine has, I have to look for the electrons in the outermost shell, or the outermost energy level. \$\begingroup\$ "Every element wants 8 valence electrons" is just a simplified description for people to get started with chemistry. Octet rule has its limits and many exceptions, \$\ce{ClF3}\$ is a typical example of hypervalent molecules. The names for positive and negative ions are pronounced CAT-eye-ons and ANN-eye-ons, respectively. B. So I want the total number of electrons … The chemical element chlorine has 17 electrons, 17 protons and 18 neutrons. Each Cl has 7 valence electrons. How many valence electrons does one chlorine (Cl) atom have? On the left, the chlorine atom has 17 electrons. Based on the periodic table the , the atomic number (Z) of chlorine is 17. We just add the valence electrons of each atoms involved. On the right, the chloride ion has 18 electrons and has a 1− charge. 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