Which of the statements below gives a cora; xa6btut6w6t;+ejy rect feature of a ligand?

  Which of the following can behave as a ligand-ci ;i lf5grns4p zt12?
I. $BH_3$
II. $NH_3$
III. $CH_4$

  An outline of the periodic table isej q8t0kho;: uy:4nwc shown below:

Which of the following are the correct names for the groups labelled X, Y and Z?

  Which of the below is a charact1vvcg (8,x usheristic property of transition metals?
I. Catalytic behaviour
II. Coloured compounds
III. Variable oxidation states

  Chromium appears to the right of vanadium in the periodic table, as shown bf .*; rhziy5xvelow: r5*.fvhxyi z;

Which of the following statements is true?

  Which of the following salts would fooakl :;gb;3a- nzb/bt rm coloured solutions when dissolved in watao: n;/3lb -abbgzkt;er?
I. $CuCl_2$
II. $ScCl_2$
III. $ZnCl_2$

  Which chemical equation represents the definition o3dz4 n6 1u5t0-ofpc /km+ 4qieahrwc sf first ionization energy?

  Which of the following is NOT a potential component of a(*1w9a(lzn9 7nbyabafl)p e acid rain?

  The $d$ orbitals of the $[Zn(H_2O)_6]^{2+}$ ion are split into two energy levels.
Why does the $[Zn(H_2O)_6]^{2+}$ ion appear colourless?

  All rain is naturally acidic duecki6 k dh*n5 ecrt/i0m)uh l+7 to dissolved __________.

  Which element would have the least attract2 4m jb)pceb,q tgvl),ion for a shared pair of electrons in a cop,e)qm)bgcb , l2j4vtvalent bond?

  Which of the following is NOT truejl0cu v c/s go4/m(q,j9nw awv))y,c l of metals?

Iron is a magnetic element ingyqva0sh0r9u8o t*y4 u5k:.rgxc.vt the first row of the $d$-block.
1.State two characteristic properties other than magnetism that allow iron to be classified as a transition metal.
2.State the full electron configuration for an iron atom.
3.Suggest why iron is more magnetic than scandium.

  A group 2 metal oxide dissolvek phi(fdq9 7x*t.:(3q mqps pcd in water would produce a solution that is:

  Metalloid elements play important romkhk8y .0h +jjles in electronic components, such as solar cells and computer chips. Which of the following is the correct definition oyk+0jkhh.m j8 f a metalloid?

1.The valence electrons in I/+s 0y(,x jro: s /qlpfbo ic:gjj.mb-2IX​ are farther from their nuclei than the valence electr j.gxfs/cj poi +mq,r :- 0by(/jbols:ons in $Cl_2$. Explain how the size of the atoms in a covalent bond can affect the relative attraction to electrons and hence the bond's polarity.
2.Calculate the electronegativity differences and then deduce the type of bonding in the following compounds $Cl_2$,HCl,and NaClClX​,HCl,and NaCl (Refer to Table 8 from the data booklet) .

  Which of the following elements has the highest first ionization energykbo mk5p g:iytrmhh1,:)8j(7 x:kdy k?

  Which one of the followic2sjm 9s6n xo4ng statements about acids is/are true?
I. Acids will neutralize bases to form salts
II. Acids produce solutions with pH greater than 7
III. Acids ionize to form $H^+$ ions when dissolved in water

  Electronegativity decreases down tvuw((cyl jbe0v 9*-v the group. The two main factors causing this trvt9ev*(w(y j 0c uvbl-end are:

  The electron affinity of car 4uzeqks9g-4 abon is $-122\,kJ\,mol^{−1}$, whereas the electron affinity of boron is $-27\,kJ\,mol^{−1}$. Which statement below best explains this difference?

  For elements in the same row X or column Y of the periodic table-ha6lb7oai q7 , some features of the outer electron shell remain coal7q7-6bhi aonstant.

Which of the following is correct?

Scandium is a transition metal that can form both 2+ and 3+ complwdw/ hx.p,u3bz;-.n fs h i7 ;obtr6heexes.
Draw the electron in boxes notation for the 4s and 3d electrons in an $Sc^{2+}$ ion.
State the equation for the third ionization energy of scandium, and indicate which electron is lost
Explain why $[Sc(H_2O)_6]^{2+}$ is coloured whereas $[Sc(H_2O)_6]^3+$ forms a colourless aqueous solution.

  Which gives the correct correcn 5y3(bsdk0;dfi3.*y r zfxnqt value of $x$ and the shape of the $Cu^{2+}$ complex, $[CuCl_4]^{x-}$?

Each element contains a different arrangepow w1 -1mgyc m z27 o z0ohx7e./bv4nd.clv9jment of electrons, and these electron configurations can also be represented using orbital diagrams. Determine the identity of each element des7 mh xjonv10 my-p4c7e.g owoz2z9/l1c w .bvdcribed below.
1.$1s^2$ $2s^2$ $2p^6$ $3s^2$ $3p^6$ $4s^1
2.$[Ne] $3s^2$ $3p^6$
3.In Period 33 with valence electrons of $3s^2$
4.
5.An ion with +1 charge, with valence electrons of:

  What is the formula of the compound formed between lithirvc 5wjsmj1( pl/* uk0um and nitrogen?

  Which of the following is the correct formula for sa) 1r chq8+toc6/u apktrontium sulfide?

  Metal M is in group 2 of the periodic table. Which isvny*7o d bb(a5 the correct formula?

  Metal M is in group 2 of the periodic tabl ;9-tocvp9j xlqk/ k0ge. Which is the correct formula?

  Atom X is an isotope of an alkav44 sh:wa l8n4uy:e i0do.ipali metal. Which of the following is a possible symin0hvui .:e4 yplao8wa4 s4d:bol for atom X?'

An atomic nucleus of element X is surrounded by electron shell*rf)9 3sjgi nks, as shown below:3g rk9js )in*f

1.The diagram does not fully describe the electron configuration of the atom or ion or the identity of element X.
(1)State why it is not possible to determine the position of element X in the periodic table from the electron configuration alone.
(2)An alternative method for describing the electron configuration of an atom or ion is to draw the orbitals as boxes and the electrons as arrows. The box-and-arrow diagram for a helium atom is shown below:

Draw a similar diagram for the atom or ion of element X, including labels for the occupied subshells.
(3)Suggest the block of the periodic table in which element X is likely to be found, giving a reason for your answer.
2.Element X could be found in group 1 of the periodic table.
(1)State the name given to elements in group 1 of the periodic table.1
(2)State the most likely period number of element X, assuming that the electron configuration in the diagram is as close as possible to that of the neutral atom.

  The complete electron rr9 c )),g.ftw: kiwh9 (lqqpdconfiguration of a neutral atom is shown below:

In which group and period of the periodic table would this element be found?

  Which compound contains two different elements l ,y6hxhu29u k p.73oeeay0ulwith identical oxidation states?

  Which of the following statements regard.:gzs xn-;wg 0w.d5m r*u2w xk4tvqkwing the periodic table are correct?
I. Anions have larger ionic radii than the atomic radius of their parent atom
II. Elements in the periodic table are arranged according to their number of protons
III. Elements within the same period will have similar physical properties

The table below contains data for the elemyd +5qid89x9lhg f- i-9piqub2p l2ssents nitrogen, fluorine, sulfur and chlorine in no particular od ds5l+fppiu qb999x2i --lyq gsh8 2irder:
Element is 1 ; Radius ($10^{−12}\,m$) is 71 ; First Ionization Energy ($kJ\,mol\,^{−1}$) is 1402.
Element is 2 ; Radius ($10^{−12}\,m$) is 104 ; First Ionization Energy ($kJ\,mol\,^{−1}$) is 1000.
Element is 3 ; Radius ($10^{−12}\,m$) is 100 ; First Ionization Energy ($kJ\,mol\,^{−1}$) is 1251.
Element is 4 ; Radius ($10^{−12}\,m$) is 60 ; First Ionization Energy ($kJ\,mol\,^{−1}$) is 1681.
1.Identify element 2 and justify your answer using the atomic radius and the first ionization energy data shown.
2.(1)Identify the number of valence electrons for element 1 and justify your answer using
the atomic radius and first ionization energy data shown.2
(2)State the electron configuration for the common ion formed from element 1.1
(3)Using section 9 (Section 10- 2025 Syllabus) in the data booklet, compare the size of the ionic radius of the common ion formed from element 1 to its atomic radius. Explain this change in size.2
3.An electron affinity for element 1 is not published and the electron affinity for element 4 is -328 $\,kJ\,mol^{−1}$. In terms of atomic structure, explain why element 1 does not have a value for electron affinity.

  Which of the following statements are true regarding the transition metal v2o4;p.lv1 5 zmvz:mcvbzru:wn+ em2s?
I. Only the electrons found in the d orbitals are involved in bonding
II. Transition metals typically have higher electrical conductivity due to the metallic bonding of the d orbital electrons
III. All of the 3d block metals will form colored compounds

  Which of the following statemw e s7,ll o*bh) es.yq:2xrr,,,qtntpents regarding the melting points of elements are correct?s qne:t .e*by xrltlo2rp,,w)7q,,hs
I. Group 17 melting points increase down the group due to increased covalent bond strength
II. Lithium has a higher melting point than potassium
III. Bromine has a higher melting point than chlorine

The period 3 elements magnesium, silicon and sulfur are found in the second, f/.a2 8izqco2d qushn9ourteenth and sixteenth columns oh9on q 2za.8is2du cq/f the periodic table.
1.State the name given to a column of elements in the periodic table.
2.State how the numbers of electron shells and outer shell electrons vary across period 3.
3.Selected physical properties of magnesium, silicon and sulfur are given in the table below:
Element is Magnesium ; Appearance is Shiny, grey ; Mechanical properties is Ductile
Element is Silicon ; Appearance is Shiny, grey ; Mechanical properties is Brittle
Element is Sulfur ; Appearance is Dull, yellow ; Mechanical properties is Brittle
Explain how the positions of the elements across period 3 help to explain their similarities and differences.
4.Period 3 contains more elements than period 1 but is equal in size to period 2. Suggest why the number of elements increases between periods 1 and 2 but not between periods 2 and 3.

Copper is a transition metal that reacts with uwi i .dm(/-iy1d.4ondawr8dchlorine to produce both $CuCl$ and $CuCl_2$​.
1.State the charge and electron configurations of copper ions in each of the above compounds.
2.Use your answer to part (a) to explain why $CuCl$ is a colourless compound whereas CuCl2CuClX​ is green-blue.
3.In the presence of excess HCl, copper ions form complexes with chloride ligands to produce $H_2[CuCl_4]$.
(1)Explain why chloride ions are able to act as ligands.2
(2)Deduce the charge of the complex ion.

1.The bonds in ammonenrzv-7 kbx+9r p5mmtz z113qia ($NH_3$​) are polar covalent.
(1)Draw the Lewis structure of ammonia.
(2)Explain why the covalent bonds in ammonia are polar.
(3)State the molecular geometry of ammonia.
(4)Explain why the bond angle of ammonia differs from that of the ammonium ion, $NH^{4+}$.
2.The boiling points of ammonia and the other group 15 compounds are shown.


Explain the variation of boiling points shown in the graph, using section 8 ($Section\,9- 2025\,Syllabus$) of the data booklet.

Magnesium is an elemenb)nr:1,n ;whlxk55q(gkrur wbk4 9ri d x /lu9t in group 2 of the periodic table.
1.State the full electron configuration for magnesium and the block it can be found in the periodic table.
2.Explain how successive ionization energies can prove that magnesium is in group 2 and period 3 of the periodic table.
3.State the equation for the second ionization energy of magnesium.
4.State an equation for the reaction between magnesium oxide and water, and comment on the pH of the resultant solution.
5.By referring to their relative ionization energies, compare the metallic behavior of magnesium to calcium and beryllium (values from the data booklet are not required).

  Which statement regarding 8cif1p 8y j-fathe periodic table is true?

  The complex ion $[Cu(NH_3)_4]^{2+}$ appears a deep blue color in aqueous solution, whereas $[CuCl_4]^{2−}$ appears a green color in aqueous solution. Which of the following statements are correct regarding the two complexes?

I. $[CuCl_4]^{2−}$ appears a green color as a result of the red light being absorbed because $Cl^−$ is a weaker field ligand than $NH_3$​
II. $[Cu(NH_3)4]^{2+}$ appears a deep blue color as a result of the blue light being absorbed because $NH_3$ is a stronger field ligand than $Cl^−$
III. $[Cu(NH_3)_4]^{2+}$ appears a deep blue color as a result of the orange light being absorbed because $NH_3$​ is a stronger field ligand than $Cl^−$

  Which is in the correct order from smallest tozj1 (kx 2iw fwqz*n0a5wwmt0. largest radius?

The oxides of two period 3 elements, X and Y, rwe-f, s 3aci jm57is:8o vk9x:joq v,yeact in water according to the equations fo osyi::v j7 ,ck, 3wx8i5vea-qj9msbelow.
I. $X_2​O_{(S)​}$​ + $H_2​O_{(l)}​$ → $H_2X​O_3$$_{(aq)}$
II. $YO_{(s)}$​ + $H_2​O_{(l)​}$ → $Y(OH)_2$​$_{(aq)}$
1.Identify elements X and Y. Justify your response.
2.Predict whether element X or Y would have a higher melting point. Justify your prediction.

  Which statement regarding the first ionization8mkb-tjlm 7zf3nsc z)/fq+wq7 xc 3q9 energies (A(g)→$A^{+}$(g)​+e-) of the period 2 correctly supports the evidence of sublevels in atoms?
I.Each period 2 element shows an increase in ionization energies across the table from left to right
II.Boron has a lower first ionization energy than beryllium because boron has an electron in the 2p sublevel
III.Oxygen has a lower first ionization energy than nitrogen due to oxygen’s greater effective nuclear charge

  The oxidation state of Cr does not change in x x2l4 -0l)vjdjh7y ynall of the following except:

  The oxidation number of X is the same in all 7ut b. 7qxs0pxthe following compounds except:

The successive ionization energijl(cj x *7g/ uf6+v3pl( bmoa zvi1ap*1p i*lges for element X is shown in the table below:
Successive Ionization Energies ($kJ\,mol^{−1}$):
1st IE2nd IE3rd IE4th IE5th IE6th IE7th IE8th IE
1000 2252 3363 4556 7004 8496 27108 31724
1.Write the equation that represents the 2nd ionization energy of element X.
2.Predict the number of valence electrons for element X and justify your response.
3.Another element, Y, is found below and in the same group as element X in the periodic table. The electronegativity value of element Y is 2.6. Predict a reasonable value for the electronegativity value of element X. Explain your reasoning.

  Which gives the correct order of incre)2a.37vi x*ftgrtquz asing radius for these isoelectronic speci3rtvx2. f)uitz g qa*7es?

The bidentate ligand, phenanthroline (phen) has the structureh3p;rg oqa bykbspn-nd(/: ; p(3 ek zy2g0no7 below.



1.Use the diagram above to demonstrate how phenanthroline can act as a ligand to $M^+$ ions.
2.Phenanthroline forms the complex $[Cr(phen)_3]^{3+}$ with chromium ions.
(1)State the charge and the electron configuration of the central chromium ion.2
(2)Explain why the salts of $[Cr(phen)_3]^{3+}$ complex exhibit magnetic properties.1
3.The tetradentate (4-coordinate) ligand, salen, forms complexes with $Co^{3+}$ ions and can produce the compound [Co(salen)]Cl. Deduce the charge of the salen ligand.