Therefore, elements whose atoms can have the same number of valence electrons are grouped together in the periodic table of the elements.. How many valence electrons do the halogens, the alkali metals, and the alkaline earth metals each have, respectively? ). claireabrenne claireabrenne Seven valance electrons, hope this helps! How many valence electrons do halogens have? See answer hunb9ilPSancelope1ze is waiting for your help. 0 Comment. A: Any element in group 1 has just one valence electron. As a result, elements in the same group often display similar properties and reactivity. How many valence electrons do the halogens have? Chemistry The Periodic Table Valence Electrons. As the atomic number increases, the reactivity of the halogens decreases. That would take significantly more energy than other elements, e.g., group #1# (alkaline metals) or group #17# (halogens.). 2 Answers. In group 13, it has 3 valence electrons. a. Valence electrons are of crucial importance because they lend deep insight into an element’s chemical properties: whether it is electronegative or electropositive in nature, or they indicate the bond order of a chemical compound – the number of bonds that can be formed between two atoms. The Halogens Alkali Metals And Alkaline Earth Have How Many Valence Electrons. Examples include hydrogen (H), lithium (Li), and sodium (Na). Add your answer and earn points. Valence electrons are those electrons that reside in the outermost shell surrounding an atomic nucleus. Column 13 - The boron group - 3 valence electrons. Show this by using the electron configurations of a transition element and a representative element as examples. By Hilman Rojak | September 6, 2020. 1 B. Bromine is in group 7 so it has 7 valence electrons magnesium is in group 2 so it has 2 valence electrons 1 B. a. A. The answer is D) 7. alkaline earth metals valence electrons ? 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). $\begingroup$ Firstly, it depends on what you count as "valence electrons". For example, the elements in the first column (sometimes labeled IA), all have one valence electron. The halogen group of the periodic table is group 17, so all halogens have a total of seven valence (bonding) electrons in their outer shell. Group 2, alkaline earth metals, has 2 valence electrons. How Many Valence Electrons Does The Element Bromine Have? In group 14, it has 4 valence electrons. A. Now there's a pretty simple way to remember how many valence electrons the representative elements have: Column 1 - The alkali metals - 1 valence electron. Skip over the transition elements. Answers: 1 Get Other questions on the subject: Chemistry. It is a metal because it it only has two valence (outer level) electrons. Play this game to review Periodic Table. In group 14, it has 4 valence electrons. If you say that, for all the d-block metals, the ns and (n-1)d electrons count as "valence electrons", then the answer is to just look at the group number.However, that obviously doesn't work for Zn, which effectively only has 2 valence electrons. How many valence electrons do the halogens have? Answers: 1 Get Other questions on the subject: Chemistry. 3 1 the periodic table basic s of the chemical bonding alkaline earth metals halogens periodic table and electron configurations. You can find out how many valance electrons an element has by looking at the group number of the element on the periodic table. Halogens are the elements of the group 17 of the periodic table: F, Cl, Br, I, At. Favourite answer. The number of valence electrons in an atom governs its bonding behavior. Both have seven valence electrons. In group 1, the alkali metals have 1 valence electron. The halogens all have seven electrons in their outer shells. Relevance. Well neon and helium are noble gases and are in group 8 and have 8 valence electrons. Metals tend to have 3 or less valence electrons. 0 0. jerry758. Valence electrons are important because: The valence electrons decide the reactivity of an element. Fluorine and chlorine exist as gases at room temperature, while bromine is a liquid, and iodine is a solid. The makes them highly electronegative, and prone to forming ionic bonds with metals, especially the alkali metal group and the alkaline earth group. Column 2 - The alkaline earth metals - 2 valence electrons. From periodic table ,we see that the atomic number of potassium is 19. How many valence electrons: 1s2 2s 2 2p6 3s2 3p6 4s 2 3d10 4p3 Chemistry. Usually an “octet of electrons” refers to the outer shell of valence electrons (ones of the highest energy level) being stabilized with 8 valence electrons. Valence Electrons Ation … Express the following number in scientific notation. Then we skip the transition elements because they have more than one charges. The elements that naturally have an octet of valence electrons are the noble gases to the far right of the periodic table. Table 2.6.2 below summarizes the number of valence electrons for each main group column of elements. Learn vocabulary, terms, and more with flashcards, games, and other study tools. the noble gases? In these compounds, halogens are present as halide anions with charge of -1 (e.g. JSintheStates. 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. 7, 1, 2 8, 2, 3. Those become 3 electrons, 4 for 14, 5 electrons for group 15, etc. All halogens form Group 1 salts with similar properties. Source(s): I teach HS chem. The transition elements have their valence electrons in orbitals of more than one energy level, but the representative elements have their valence electrons in orbitals of only one energy level. However, halogens readily combine with most elements and are never seen uncombined in nature. The electron configuration in the outer shell is ns 2 np 5 . Examples include neon (Ne), argon (Ar), and krypton (Kr). 8, 2, 3. As a general rule, fluorine is the most reactive halogen and astatine is the least reactive. New questions in Chemistry. Using the old Group Numbering--The halogens are in Group VIIA -- 7 valence electrons. The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups. If you view a periodic table, Groups 1 have 1, 2 has 2.. and then you skip to groups 13 - 18. Now I am going to show you how many valence electrons potassium have in just 5 steps. Then we skip the transition elements because they have more than one charges. Get an answer to your question "How many valence electrons do alkali metals have? The noble gases are in Group VIIIA -- 8 valence electrons. As you go across the group, each group increase by one valence electron. Select the correct answer. Compare and contrast the Bohr Model and the Quantum Mechanical Model. how many moles of lithium (li) are produced? given: 2libr + ba → babr2 + 2li in this chemical reaction, 325 grams of barium (ba) react completely. 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. In group 1, the alkali metals have 1 valence electron. How many valence electrons do atoms with the following electron configurations have? Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons). Chemistry, 22.06.2019 03:50, Pizzapegasus1. Group 2, alkaline earth metals, has 2 valence electrons. 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