The sign of the charges in the subscript is ignored while writing the molecular formula. However, one Ca 2+ cation requires 2 Cl atoms as 2Cl - to balance the charges and form a neutral compound.īy criss-crossing the numerical value of charges and using it as a subscript, the correct ratio of the ions is obtained to conclude the formula of AB 2 as CaCl 2. There are about 90 naturally occurring elements known on Earth. As described in the previous section, an element is a pure substance that cannot be broken down into simpler chemical substances. The valency of Cl is 1, and one Cl atom can accept one electron to form one Cl - anion. Represent a chemical compound with a chemical formula. The valency of Ca is 1, and the one Ca atom comfortably loses two electrons to form Ca 2+ cation. The simplest method is to employ the criss-cross method. Criss-cross (cross-multiplication) method to deduce the Molecular Formula One Ca atom, and two Cl atoms form the compound Calcium Chloride (CaCl 2). One Cl atom can only pick one electron therefore, the two electrons are accepted by 2 Cl atoms to give 2Cl - anions. The Group 2 Calcium (Ca) atom can easily lose two electrons, therefore, The element B from the Group 7 and period 3 is Chlorine (Cl). The principal quantum number of the outermost valence shell of element B is 3 therefore, the element belongs to the 3 rd period (row) of the periodic table. Therefore, halogens have high negative electron gain enthalpy values and attain electrons easily. The halogens are less by one electron from attaining the stable inert gas configuration. Link Embed Export Structural formula image 3D model image MOL file Chemical. The principal quantum number of the outermost shell of element A is 4 therefore, the element belongs to the 4 th period (row) of the periodic table.Įlement A belonging to Group 2 and period 4, is Calcium (Ca).ī belongs to group 7 based on the valence shell electronic configuration of 7. Moreover, elements could repeat in the vector C and this fact is lost when we. Layout Theme Desktop Touch Information Help About. Group 2 elements can therefore lose two electrons to attain stability. Metals have low ionization enthalpy they can easily lose electrons to attain the nearest stable, inert gas configuration. Therefore, A belongs to the Group 2 of the periodic table. Instructor Julie Zundel View bio Learn about periodic table nomenclature, element notation, and the use of subscripts, coefficients, and superscripts. What is the formula of the ionic compound formed between these elements?Ī has a valence shell configuration of 2. Magnesia, a district of Eastern Thessaly in GreeceĪlumina, from Latin alumen (gen.The electronic configuration of two elements A and B are.
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