On the right, the chloride ion has 18 electrons and has a 1− charge. 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. \$\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. 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. H = 1----- 26 electrons. An atom, which is the fundamental unit of an element, contains an equal number of electrons and protons. B. 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… How many electrons do carbon and oxygen share? So I want the total number of electrons … Each Cl has 7 valence electrons. The 7 electrons that are found in the valence shell are the electrons used to bond with the other atoms. The four P-Cl bonds use 8 electrons. Based on the periodic table the , the atomic number (Z) of chlorine is 17. Cloride is a chlorine atom, which has found that last electron and added it to the outermost valence shell to become stable. Chlorine is an element that belongs to Group7A in the periodic table. That's a total of 33 valence electrons. Each Cl has 3 lone pairs for a total of 12 lone pairs. 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. On the left, the chlorine atom has 17 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. P has 5 valence electrons. 4 (Four) Nylon is a "big" covalent molecule used to make backpacks. We just add the valence electrons of each atoms involved. The chemical element chlorine has 17 electrons, 17 protons and 18 neutrons. This means that chlorine has 7 electrons in its valence shell of electrons. 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. Cl = 7 x 3. 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