The number of valence electrons in an atom governs its bonding behavior. The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups. In group 14, it has 4 valence electrons. A: Any element in group 1 has just one valence electron. 1 Answer Nam D. May 21, 2018 #7# Explanation: Fluorine's electron configuration is: #[He]2s^2\2p^5# or #1s^2\2s^2\2p^5# Therefore, its valence shell is #n=2#, and so it contains #2+5=7# valence electrons. Those become 3 electrons, 4 for 14, 5 electrons for group 15, etc. alkaline earth metals valence electrons ? 1 s 2 2 s 2 2 p 6 3 s 2 c. 1 s 2 2 s 2 2 p 6 3 s 2 3 p 1 d. 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 10 4 p 2 The electron configuration in the outer shell is ns 2 np 5 . Therefore, elements whose atoms can have the same number of valence electrons are grouped together in the periodic table of the elements.. However, halogens readily combine with most elements and are never seen uncombined in nature. Valence electrons are important because: The valence electrons decide the reactivity of an element. The elements in each group have the same number of valence electrons. Valence Electrons Ation … Compare and contrast the Bohr Model and the Quantum Mechanical Model. Using the old Group Numbering--The halogens are in Group VIIA -- 7 valence electrons. The Halogens Alkali Metals And Alkaline Earth Have How Many Valence Electrons. When mixing a strong acid and water together, it is recommended that you do which of the following? How many valence electrons do the halogens have? The halogens all have seven electrons in their outer shells. How many valence electrons do atoms with the following electron configurations have? In group 14, it has 4 valence electrons. Step-1: First, find the atomic number of potassium from periodic table. Fluorine and chlorine exist as gases at room temperature, while bromine is a liquid, and iodine is a solid. Chemistry. Chemistry The Periodic Table Valence Electrons. Cl-, Br-, etc. 1, 5, 7. The halogens posses seven valence electrons; Explanation: Valence electrons are the electrons in the outermost orbitals of the atoms, which are the orbitals with the highest main energy level (principal quantum number). A. Bromine is in group 7 so it has 7 valence electrons magnesium is in group 2 so it has 2 valence electrons See answer hunb9ilPSancelope1ze is waiting for your help. Elements in group #14# have #4# valence electrons.Meaning that to achieve a stable octet they need to either gain or lose #4# electrons in total. If you view a periodic table, Groups 1 have 1, 2 has 2.. and then you skip to groups 13 - 18. claireabrenne claireabrenne Seven valance electrons, hope this helps! New questions in Chemistry. As you go across the group, each group increase by one valence electron. 0 0. jerry758. Both have seven valence electrons. That would take significantly more energy than other elements, e.g., group #1# (alkaline metals) or group #17# (halogens.). Add your answer and earn points. A. 2, 4, 6. 6 35. a. This may seem a bit confusing when one looks at the periodic table, since chlorine is the seventh element in its row, but iodine is the seventeenth. Play this game to review Periodic Table. It is a metal because it it only has two valence (outer level) electrons. As a general rule, fluorine is the most reactive halogen and astatine is the least reactive. Relevance. Examples include hydrogen (H), lithium (Li), and sodium (Na). The number of valence electrons in 1s 2 2s 2 2p 6 3s 1 has to be given. 1 s 2 2 s 2 b. 65 % (525 Review) How many valence electrons do chlorine, bromine, and iodine have? How many valence electrons do halogens have? Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons). 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