Practice 62 In the Lewis electron-dot diagram, the dots represent 1) valence 2) 3) 4) Practice 66 Which Lewis electron-dot diagram represents calcium oxide?. When you draw the Lewis structure for Calcium you'll put two 'dots' or valance electrons around the element symbol (Ca). A Lewis electron dot diagram (or electron dot diagram or a Lewis diagram or a Lewis structure) is a representation of the valence electrons of an atom that uses dots around the symbol of the element. Or since the outermost energy level of Ca2+ is now the 3s and 3p which are all filled, you could draw it with eight dots, but I wouldn't. Using the Periodic Table to Draw Lewis Dot Structures. Calcium has two valence electrons. 0. Take the two electrons away and it has no dots. If there is an excess of water this fire of phosphine will not normally ignite surrounding combustible material. An atom's lewis dot structure has two dots. Since it is in Group 2 it will have 2 valence electrons. Each Group, or column, is indicated by a roman numeral which represents the number of valence electrons. To determine a Lewis structure, all you need is a Periodic Table. Calcium hydride (CaH2) CaH2. Answers (2) Wilburt 30 June, 15:39. Explanation: Lewis dot structure are the structures which tells us the number of valence electrons around the nucleus of an atom in a molecule. 2. The PT is a map for the Lewis structure of every element. Note: Calcium is in Group 2 (sometimes called Group II or 2A). lithium, because it is a group 1 element with two bonding electrons. It reacts with water to form calcium hydroxide and phosphine, a flammable poisonous gas. EINECS 232-189-2 Calcium phosphide appears as red-brown crystals to gray granular lumps. Phosphine will normally ignite spontaneously in contact with air. The number of dots equals the number of valence electrons in the atom. A Lewis Dot Structure can be made for a single atom, a covalent compound, or a polyatomic ion. magnesium, because it is a group 2 element with two valence electrons. HSDB 8095. The Lewis dot diagram would have two dots. Answer: The correct answer is: 'Carbon, because it is in group 14 and has four valence electrons'. The periodic table has all of the information needed to draw a Lewis dot structure. The Lewis dot structure representing calcium phosphate is: Lewis Symbols. Write to me in PM, we will talk. The Period. DTXSID60894886. which of the following elements could it be, and why? The reactivity of calcium, valence electron and what is the structure after calcium react with other elements like calcium chloride CaCl2 (Horizontal rows)= the number of the shells The Group. Also, based on the sourced electronegativity chart, the difference in electronegativity is 0.9 (Ca is 1.0 and Si 1.9), so it would be polar covalent. 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