2. Since it is in Group 2 it will have 2 valence electrons. Calcium phosphide appears as red-brown crystals to gray granular lumps. lithium, because it is a group 1 element with two bonding electrons. Each Group, or column, is indicated by a roman numeral which represents the number of valence electrons. Calcium, because it is an alkaline earth metal in period 4. If there is an excess of water this fire of phosphine will not normally ignite surrounding combustible material. Note: Calcium is in Group 2 (sometimes called Group II or 2A). magnesium, because it is a group 2 element with two valence electrons. DTXSID60894886. 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?. Calcium has two valence electrons. When you draw the Lewis structure for Calcium you'll put two 'dots' or valance electrons around the element symbol (Ca). HSDB 8095. 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. The Lewis dot diagram would have two dots. which of the following elements could it be, and why? Using the Periodic Table to Draw Lewis Dot Structures. An atom's lewis dot structure has two dots. (Vertical colmns) gives the number of outer electrons. The reactivity of calcium, valence electron and what is the structure after calcium react with other elements like calcium chloride CaCl2 Explanation: Lewis dot structure are the structures which tells us the number of valence electrons around the nucleus of an atom in a molecule. A Lewis Dot Structure can be made for a single atom, a covalent compound, or a polyatomic ion. Phosphine will normally ignite spontaneously in contact with air. 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. The PT is a map for the Lewis structure of every element. To determine a Lewis structure, all you need is a Periodic Table. Answers (2) Wilburt 30 June, 15:39. Answer: The correct answer is: 'Carbon, because it is in group 14 and has four valence electrons'. 0. EINECS 232-189-2 The number of dots equals the number of valence electrons in the atom. Write to me in PM, we will talk. 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. calcium, because it is an alkaline earth metal with two inner shell electrons. ... For example, the Lewis electron dot diagram for calcium is simply. Take the two electrons away and it has no dots. The Period. The periodic table has all of the information needed to draw a Lewis dot structure. Calcium hydride (CaH2) CaH2. 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