Which of the statements below gives a correct feature of a ligand?3k:c l *7ryato,d 7mjc

  Which of the following can behave as a 7a mmbw(3j3 1xicf ,eyligand?
I. $BH_3$
II. $NH_3$
III. $CH_4$

  An outline of the periodmtw+ 51w8afg 3en5sbcic table is shown below:

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

  Which of the below is a characteristic property of transitiof wqv;y-st8v 8;tm8mgpd z,1jn metals?
I. Catalytic behaviour
II. Coloured compounds
III. Variable oxidation states

  Chromium appears to the right of van/*hwyl :xg4 rwadium in the periodic table, as shown below: /w glhxyw4*r:

Which of the following statements is true?

  Which of the following salts would form coloured solusf1aluie4x +y(eb5.64p 1vr 6lbbkc htions when dissolved in watee1u6l+fi(h54ap4 e by. xrvsckb6b1lr?
I. $CuCl_2$
II. $ScCl_2$
III. $ZnCl_2$

  Which chemical equation represents the definitig* hdal a3f,jizf* xp0z7b3 0con of first ionization energy?

  Which of the following is NOT a potential componeca/.9bztss 5cnt of 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 due to dihhar. 3mt3ms qnh4m.jy + wb:en /ua:)ssolved __________.

  Which element would have the least attraction for a slyt *qe; ,,v78tyb2va7az mzlhared pair of electrons in a coval2 mal tyeqvvz7t 7ly ,,z;b*a8ent bond?

  Which of the following is NOT truef5r3 xq:b knt6 of metals?

Iron is a magnetic element in the d* zhqfp;hm8(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 szq- /mm( ad5lholution that is:

  Metalloid elements play importwaidd1kt qx j6gr; k1 e2od421ant roles in electronic components, such as solar cells and computer chips. Which of the following is the correct definition1g1qi ew2 x4k6rdktj2od1;da of a metalloid?

1.The valence electrons in I2IX​ are farthergsh-2pc hmn.f26 m(nfq7 je;j from their nuclei than the valence 6m(fpcgjh7qhnmes;n-2 2. j felectrons 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 we(7wp +;o irazo*,r dgbh6/vhas the highest first ionization energy?

  Which one of the following statements anh/pncgwcvi- +1 ,c /ibout 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. kwr68tlhb) ( fvqwd7/ The two main factors causing this trend ar rb d6(v/lw8k7)wqhf te:

  The electron affinity of cam9ziq6 3p)usghad*,0 yxpqs* rbon 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,sk:ed(a3u q d8jcsu -, some features of 3j su ,e-asu8d ckqd:(the outer electron shell remain constant.

Which of the following is correct?

Scandium is a transition mi6nkv;ca w8p z;(;+4yenjqebetal that can form both 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 cxkmx -d;g by;.orrect value of $x$ and the shape of the $Cu^{2+}$ complex, $[CuCl_4]^{x-}$?

Each element contains a different arrangement of electrons, and these elecwo7 exn;+x-wz tron configurations can also be represented using orbital diagrams. Determine the identity of each element described beloww+; xnz oe-7wx.
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 lithium akl+dt+f3wde) l:ro ( kk/b uh,nd nitrogen?

  Which of the following 0n yut ,-mzccj8c u07dis the correct formula for strontium sulfide?

  Metal M is in group 2 of the perio:exgpzpt :8/ hdic table. Which is the correct formula?

  Metal M is in group 2 of the periodic table. Which is thex6 9sekvl((5us0j)rn(xfmptt+ k.b r correct formula?

  Atom X is an isotope wn ))m fhp1js;s+ svr+of an alkali metal. Which of the following is a possible symbol fonp wj;)sh)s +rv+1mfs r atom X?'

An atomic nucleus of element X is surrounded by electrf5.0p eioecsj7 4dug0xji5m. on shells, as shown below:pm.07g405 .oxid sfjeecjiu5

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 neutral atomd;,c96s))b ep s3:epxtu glxj 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 oxidat3p) m.ca pg lzb-/f.noion states?

  Which of the following 31 z/q asdkms2g; 8zglstatements regarding 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 elements nitrogen, fluorine, s o;b1f*m 4vql:a ,fmzkulfur and chlorine in no particular ork;v1 z:fal4mo*fb , mqder:
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 statzf7 zfhzis .-4cg (.kkbcq+(ydp h6y+ements are true regarding the transition metals?
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 the melting points of elements 0:tlcb68 8d a l;;k) zivx fsfoq7n.hu;pse 5mare co.u p x ilbl8 sn5;mfqsz6taoe)vc7f:;0khd 8;rrect?
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 ar;+xqjzw k,b;v1+n. re eld d.je found in the second, fourteenth and sixteenth columns of the perlex;; r+.wjbqz.j n e1dvk ,d+iodic 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 we7; ,9 kcekn-nugwn c)ry +mh rfx44)vith 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 ammonia ;5n qc8xs hf*jxx(d59iw3k yn($NH_3$​) 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 elemen -zodtkw/*9xeyl 0q 3tt 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 regardinwcgs1 :09b/(rdwavvp, ox;s bg the 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 ton 0jtq+- 9vr efa:lxep8g;pnx6o h/x8 largest radius?

The oxides of two period 3 elements, X and Y, react in wa0+yda-q45s c :fwpqjater according to the equatioq 4pa+s fc:jyqdw -a05ns 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 regaryn8yz*9 oqpw3ding the first ionization 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 a:ve ;b5;ns uezll of the following except:

  The oxidation number of X is the same in all the following fkn6vtb, 1qt qv5,h)a;ozyom 7*f9xp compounds except:

The successive ionization energies for element X is sh;1a r*zi i6hrdown 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 r1k itaj ,w,gr( nklp274*x ffof increasing radius for these isoelectronic species?k2wrgi rnf7lx,t*4a,(pkj 1 f

The bidentate ligand, ofoi+ cp*yi6/-imuh 4phenanthroline (phen) has the structure 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.