Which of the statements below gives a correct feature1 am:+k,*jyvx1su9ud f) zclj of a ligand?

  Which of the following can behave a euqd2 w-u:0acg5fy) gs a ligand?
I. $BH_3$
II. $NH_3$
III. $CH_4$

  An outline of the periodic table is shown bhgg;(ct/5h +g zhni;fp ddy 0:elow:

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

  Which of the below is a characteristic property of2xjq rwv j a3ujhi)c0mj:5ry./1vul- transition metals?
I. Catalytic behaviour
II. Coloured compounds
III. Variable oxidation states

  Chromium appears to thee1oef 56 n akw5fw amb6x;0,yn right of vanadium in the periodic table, as shown below: eeaofa6mw5n1,wbk 5x60 f n;y

Which of the following statements is true?

  Which of the following salts would form coloured solutgpj4 gk5 g;r.hions when dissolved in wat g.;pg4k gh5rjer?
I. $CuCl_2$
II. $ScCl_2$
III. $ZnCl_2$

  Which chemical equation represk.q8.llub +*leib9tc ents the definition of first ionization energy?

  Which of the following is NOT a potential component of am bflwl*/ 8m 0nr s.spqy0-0ggcid 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 due to dissolved ______cdmp i;;0 v3jy7a:uteg- t6fk____.

  Which element would have the lq9smb m 324wvxeast attraction for a shared pair of electrons in a covalent bb3x4 m9sv 2mwqond?

  Which of the following is NOT tru0ypko4p: fx*) cj-0 1eohrjzmeoz1(ye of metals?

Iron is a magnetic element in -dfj+8vl5 tq tlj2f 4xthe 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 dissolved in water would produce a solution that is5j 8yumc v.*9xfxf5mt:

  Metalloid elements play importantn+hnw)lmk 7; i roles in electronic components, such as solar cells and compui)m7n lh;kwn+ ter chips. Which of the following is the correct definition of a metalloid?

1.The valence electrons in I2 y9u1 ht7l0df 1ottsl.5. aiveIX​ are farther from their nuclei than the valence electrons i ul5tydf0 .sv9e1h 7tti a.1oln $Cl_2$. 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 fignf0c m;bz3h-j2j ut:rst ionization energy?

  Which one of the following statementswf3lua6+gb w ; 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 the group. The two main factors caus2xxc/i2jlqp9 cq z*q9,kk jnn2z7 8vs ing this trend /lqzj , sz9cckj8 2ixp*nnqk v9x27q2 are:

  The electron affinity of carbon is (c rmboyx1; ja pbo )1o)c+:cr$-122\,kJ\,mol^{−1}$, 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 cor ctfig2b)52r, 74zrzjzx cj /lumn Y of the periodic table, some features of the outer electron shell 2t7) rzrg 4izzbfcrcj/2x j5, remain constant.

Which of the following is correct?

Scandium is a transition metal that can form both;ge9 yn(tpj q3 2+ and 3+ complexes.
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 ex)4dgwhkn w6 1+ xcg8correct value of $x$ and the shape of the $Cu^{2+}$ complex, $[CuCl_4]^{x-}$?

Each element contains a different arrangement of electrons, and these electrouiupakq x+g n- y6: 7rl5w+2azn configurations can also be represented using orbital diagrams. Determine the identity of each element described bu5la +yi6 pz xagkqwr:2u-n+ 7elow.
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 cck5*ifr:3gq;xdt m g 1ompound formed between lithium and nitrogen?

  Which of the following is the cor-/y. weg iotk4rect formula for strontium sulfide?

  Metal M is in group 2 of the periodic table*gp (s )lb28ipl1 we (urme(uf6tdre 3. Which is the correct formula?

  Metal M is in group 2 of the periodic tax -ud yjm ;9w,ni+coyu 8nr(yc 3.bm-cble. Which is the correct formula?

  Atom X is an isotope of an alkali metal. Which of the following is a pons ,-i, bc*o;:pueghrssible syc:rp*g;ebu ,o,s inh- mbol for atom X?'

An atomic nucleus of element X is surrounded by electron shells, as sho gfl;bq*mqj pu4j*;6n wn below: npl4mu j*q*;j qfb6g;

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 configuration of a nl jt;(5oo9pv seutral atom is shown below:

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

  Which compound contains two different elements with identical oxidation stateu,p cdkw2igu;f94r)m s?

  Which of the following statements regarding the periodic table are c02r4oa ewe zx;.3qhwa,; ghlcorrect?
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 elements nitrogen, fluorine, sug,hrt b.fy(s/lfur and chlorr y/.g tf,h(bsine in no particular order:
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 metals?nf us/ ( -m8m-v2xsint
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 statements regarding 4m 7 l6.ipfdsbthe melting points of elements are cds li4fb.6p7m orrect?
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 awcqa1c8*+ tp (-(gwofa q cdpmv6l;9snd sulfur are found in the second, fou9 ct(aqw;fp1 s6mdolwq c+av *p-c(g8rteenth and sixteenth columns of 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 rc7jm to5v*g6(o9.qmqu 6 g rkmeacts with chlorine 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 ammoniabjqz,ed2vn f 0wka+13 ($NH_3$​) 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 element in group 2 of0ms wb lds:*7f 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 the periodic 0ln (x.huf igrhuq);ja: 8zz,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 fil h5jwyb8ltuh oy0,z/5:c(gpuh *n.rom smallest to largest radius?

The oxides of two period 3 elemenjfcy 8y7sc3t+ 1de2jets, X and Y, react in water according to the equatitjse17y + cd8 2cjfe3yons below.
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 ionization 5e,*)gt6qg7u6vlxqiip dy qf jae*(-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 all osb1.e+, +m t u9b.hvimmr6 cbkf the following except:

  The oxidation number ofrfp2qz ,-q nqn::t nk,w. 5mez X is the same in all the following compounds except:

The successive ionization energies for ele)e /xee a1j2bement 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 increasi,go0-;lgekri( e j4vwz vzj5 2ng radius for these isoelectronic species4gvwj-g ze,er (;io0k5jvl z2?

The bidentate ligand, phenanthroline (phen) has the swsu9p, s daz+4tructure 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.