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