Question

3.2 Periodic trends 1. (0620-5 2012-Paper 1/2-Q21) Which properties of the element titanium, Ti, can be predicted from its position in the Periodic Table? forms coloured compounds conducts electricity when solid can be used has low density as a catalyst X A X X Xx 2. (0620-W 2012-Paper 1/1-Q20) The diagram shows an outline of the Periodic Table. U V W X Y Which of the elements U, V, W, X and Y would react together in the ratio of 1:1? A Uand X B Uand Y C Vand Y D Wand X 3. (0620-5 2013-Paper 1/1-022) Which property of elements increases across a period of the Periodic Table? A metallic character B number of electron shells c number of outer shell electrons D tendency to form positive ions

Answer 1

o Ti can act as catalyst as Tio, and as Ticlz in Ziegler- Natta catalyst Ti has very low density also 4.506g/cm3 Ti Conducts weakly electricity but Ti compounds are generally a Since in compounds generally Ti exi T +3 or Tity oxidation state in to are generally coloured has due to State jt forms blue colour compounds drd transition so option no. (% is correct a Udy can react in lil as uis element of gb 1 with valency to ļ y is element of gp 17 with valency t. option (B) u&Y 3 In a period no. of outh shell elechons increases option (c) as in a period (3) Na(sodium) has 1 valence é & Mg has 2 valence é & Al has 3 valence í soon.

c de + 2k Br + Bro + 2 k ce (1) Colour changes to orange KBr is colourles When reaction takes place orange I Brown colour appear due to formation of Brg. () Salt is kce Potressium chloride Since Chlorine in more reactive than Bromine So Bromine can't displace chlorine from Potassium chloride (1) Halogen exist in diatomic State means in halogen molecule there are a atoms Present as in Halogen atom there are 7 valence é so complete their octet they form covalent bond (shaining of e) with another hallogen atom and thus gets stablise since of atom do shaining via covalent bond to they for diatomic molecule ale= -ca Na k Ica ZLNE W Transition metals A Ti & v Titanium Vanadium

. in period 3 Na, mg Sodium & Magnesium Table is Present . as in Periodic 3)I 3 2,8,1 atomic no = 11 Sodium (Na) 23 Protons in its nucleus 23 proton = 23 elections = 23 atomic nou vanadium (V) has az atomic no 575k 2 Nat on $7591 Naz Osim 1 Sodium Peroxide co (b) fill in the blanks au An element is a substance containing only - one type of atoms. (11) The gb vil elements exist as maleales containing (11) Carbon has a giant covalent structures with 1 many strong bonds elements such as ison & copper, which foren coloured compounds are called transition elements