They are sometimes also called the representative elements and they are the most abundant in the universe. > The most common oxidation number for Group 7 elements is -1, as in "HF", "CaCl"_2, "NaBr", and "KI". The elements in main metals sub-group 7b are fluorine, chlorine, bromine, iodine, and astatine. Because Hydrogen, aswell as the elements in group's 1 and 7, all have 7electrons in their outer shell, so they all have the same valency. It isn't going to give up its electrons. View Notes - Group 7A Elements PPT from CHM 72052 at Arizona State University. Add your answer and earn points. Group 7A elements are also called: A) noble gases. Elements of the group (1A) in the periodic table are called alkali metals (alkaline metals) because they react with water forming alkaline solutions. Let’s now look at the electronic configuration of these elements.. Electronic Configuration of Group 17 Elements Group 7A elements have 7 valence electrons.In order to attain a stable octet configuration ( ie 8 electrons in the valence subshells) they will gain 1 electron and become ions with … Give the name and symbol or formula of a Group 7A(17) element or compound that fits each description or use: (a) Used in etching glass (b) Compound used in household bleach (c) Weakest hydrohalic acid (d) Element that is a liquid at room temperature (e) Organic chloride used to make PVC. Group 17 elements are also known as: (a) halogens (2) (name still in common use) (b) Group VIIA (name no longer used) Group 17 elements are non-metals; Group 17 elements exist as diatomic molecules (X 2) when not combined with other elements. when atoms gain electrons group of answer choices, Small Group 6 elements, oxygen and sulfur, tend to either gain two electrons or bond covalently. The group 17 elements include fluorine(F), chlorine(Cl), bromine(Br), iodine(I) and astatine(At) from the top to the bottom. Shocking video shows man 'dumping his six-month pregnant nurse girlfriend's body off side of a Queens expressway after strangling her to. • View Available Hint(s) lodine bromine boron aluminum Elements ppt. Elements in group 1A have one valence electron, elements in group 2A have 2 valence electrons, etc. Its oxidation number in compounds is always -1. B) halogens. NikTBS NikTBS It is actually Group 3A elements. Elements in group 7A in the periodic table are called the halogens; elements in group 6A are called the chalcogens. Some of these groups have special names. Of the elements Fe, Hg, U, and Te, which is a representative element? Periodic Table of the Elements Atomic Number The periodic table of the elements shows the types of elements that make up the universe and the relative properties of the atoms. 1 only b. Group 7 elements all have seven electrons in the outer shell and either gain one electron to become a -1 ion or they make one covalent bond. The tendency of an element to react chemically is closely related to. Cs (cesium) C) alkaline earth metals. On the blank periodic table. D) alkali metals. Group 17 Elements. They are called “halogens” because they give salts when they react with metals.So, now you know what halogens are! Expert's Answer. –Elements in same group have same valence electron configuration; similar properties –Same group comparison most valid if elements have same metallic or nonmetallic character –Group 1A and 2A; Group 7A and 8A –Careful with Group 3A - 6A The group 3A elements are also known as the chalcogens. D) alkali metals. I just took the test. Enamel is mainly calcium carbonate, CaCO 3, and hydroxyapatite, [Ca 3 (PO 4) 2] 3•Ca(OH) 2. The elements of the periodic table in groups 1A to 8A are called the main-group elements. a. New questions in Chemistry. Problem 87 Hard Difficulty. The elements in group 7 are called the halogens. Some of the main group elements have common names, such as the alkali metals (1A), the alkaline earths (2A), the halogens (7A) and the noble gases (8A). The name "chalcogen" means "ore former," derived from the Greek words chalcos ("ore") and -gen ("formation"). But the other Group 7 elements can have various oxidation states. The noble gases are sometimes called the rare gases because of their low abundances. Each of the elements in a group (a column) have qualities in common. Order the group 6A elements according to their ability to act as a reducing agent. a. Lactic acid, C 3 H 6 O 3, is the main cause of tooth decay. 2Na + 2H 2 O → 2NaOH + H 2 ↑. This is because as you move down the group the number of energy levels increases which reduces the nuclear charge and thus reducing the ease of gaining electrons. A. noble gases B. nonmetallic elements C. representative elements D. transition elements. ; Group 17 elements can combine with nearly all the elements in the periodic table. Elements in group 7A have 7 valence electrons. What halogen is in the third period? General Properties Group 17 (VII) Elements: Halogens The most electronegative group - … Solution.pdf Next Previous. Which of these Group 1A elements is the most reactive? The elements of group 14 show a greater range of chemical behavior than any other family in the periodic table. Group 7A elements Group 1A elements Group 3A elements 1 See answer alexwest13 is waiting for your help. more valence electrons. Niamat K. Solution for Identify the Period 4, Group 7A (17) element. 2 only c. 3 only d. 2 and 3 e. 1, 2, and 3 9. Question 1 Fluorine is the most reactive element in group 7A of elements.. Further Explanation Reactivity of Non-metals down the group The reactivity of non-metals decreases down the group in a periodic table. Elements with similar reactivity are put into the same column or group. Group 7A ( 17) elements are found in many compounds, but Group 8A ( 18) elements are not. C) alkaline earth metals. 2. R34 Elements Handbook Elements Handbook Group 7A: Halogens F Tooth Decay Your teeth have a hard outer layer called enamel. Group 2A ( 2) c. F d. Rb e. N. Need this assignment done for you, … Jan 09 2021 11:16 PM. In it, the elements are arranged by increasing atomic number (the number of protons in the nucleus of an atom). Related Questions. Compared with Group 1A elements, Group 7A elements have. the number of valence electrons in atoms of the element. (a) What is the most common oxidation state of the chalcogens compared to the halogens? Three of the five elements—carbon, tin, and lead—have been known since ancient times. 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