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QUESTION 3 For each ionic compound formula, identify the main or A group in the periodic table to which X belongs. (Write the group number either as 1a, 2a, 3a... or 1, 2, 3 etc.) a) CaX 2 - COXEFESÞ) Al 2 X3 c) XPO 4 = ) XCO 3 - Na 2 X

Answer 1

using criss cross methools By Aty 3x a Caxo - cat2 ya 1 oxidation state shrown by lol group 17th Element x=(fcd, B8, I [ Exception tha Hydside (group 1st of 17th) L a carta Group Mo = 17th (Halogen group) b) Alatz - Alt 3,2 -2 oxidation state is shown by group 16th Element x=cos, se, Tel on Group No = 16th (Chalcogen) o xpou Xto por as we know poy has a3 Charge on it it will be x+3 poy3 +3 oxidation state is being shown by 13th group Element (B, Al, Gia, In ) ta Group ( 13th) so we have to multiply it by 3

d) state x 37 x 43 02 Again the +3 oxidation shown by group 13th element Logroup 13 XCO3 xt cost as we know (Og has - charge so we have to multiply by 2 tex2 (02-27 +2 Oxidation state is shown by group and element (Be, mg, ca, so) group and f) Nagt - Nat x2 Again -2 oxidation state shown by group 16th element Group 16 (Chaleogens) [os, se