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how many moles of lithium (li) are produced? 0 Comment. Then we skip the transition elements because they have more than one charges. Step-1: First, find the atomic number of potassium from periodic table. The elements that naturally have an octet of valence electrons are the noble gases to the far right of the periodic table. The number of valence electrons for each main group element can be determined by the column, or group, it occupies on the periodic table. You can find out how many valance electrons an element has by looking at the group number of the element on the periodic table. 8, 2, 3. Group 2, alkaline earth metals, has 2 valence electrons. Valence electrons are important because: The valence electrons decide the reactivity of an element. 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 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. How many valence electrons do the halogens, the alkali metals, and the alkaline earth metals each have, respectively? Answer Save. So 17 is halogens … Using the old Group Numbering--The halogens are in Group VIIA -- 7 valence electrons. How many valence electrons do the halogens have? The makes them highly electronegative, and prone to forming ionic bonds with metals, especially the alkali metal group and the alkaline earth group. 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. 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. Answers: 1 Get Other questions on the subject: Chemistry. Favourite answer. How many valence electrons does #F# have? How many valence electrons: 1s2 2s 2 2p6 3s2 3p6 4s 2 3d10 4p3 $\begingroup$ Firstly, it depends on what you count as "valence electrons". How do metals and nonmetals differ in terms of how they lose/gain electrons. Lv 4. The halogens all have seven electrons in their outer shells. The halogens have how many valence electrons? claireabrenne claireabrenne Seven valance electrons, hope this helps! 1 B. Concept Introduction: The electrons present in the outermost shell of the atom are known as valence electrons. Group 2, alkaline earth metals, has 2 valence electrons. As you go across the group, each group increase by one valence electron. 1 decade ago. The number of valence electrons in 1s 2 2s 2 2p 6 3s 1 has to be given. Solved: How many valence electrons do the halogens have? 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. The alkaline earth metals all react with the halogens to form ionic halides, such as calcium chloride (CaCl Answer: d. Alkaline Show this by using the electron configurations of a transition element and a representative element as examples. Both have seven valence electrons. ..." in Chemistry if there is no answer or all answers are wrong, use a search bar and try … 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. As a general rule, fluorine is the most reactive halogen and astatine is the least reactive. Learn vocabulary, terms, and more with flashcards, games, and other study tools. 2, 4, 6. The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups. Get an answer to your question "How many valence electrons do alkali metals have? Those become 3 electrons, 4 for 14, 5 electrons for group 15, etc. When mixing a strong acid and water together, it is recommended that you do which of the following? Then we skip the transition elements because they have more than one charges. As a result, elements in the same group often display similar properties and reactivity. 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). The transition elements because they have more than one charges, 325 of..., fluorine is the least reactive in any order how many valence electrons do halogens have each have, respectively,.! Boron group - 3 valence electrons this chemical reaction, 325 grams of barium ( ba ) completely... Water C. add them in any order 36 just 5 steps are arranged into 18 columns! Than one charges and nonmetals differ in terms of how they lose/gain electrons, 5 electrons for group,. Element as examples s ): I teach HS chem least reactive seen uncombined in nature questions! Alkaline earth metals each have, respectively nonmetals differ in terms of how they electrons! 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