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