Which of the statements below gives a correct feature of a ligand?:/n-f +n t*3q 9ebi -h.qny9ynudeazh

  Which of the following can behave as a ligak +28 5*twbt jlsl( hl6(b)(cxcu eohond?
I. $BH_3$
II. $NH_3$
III. $CH_4$

  An outline of the periodic table is uz 7x/6tzrkw0shown below:

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

  Which of the below is a chari k mno+n.22x64fuhe oacteristic property of transition metals?
I. Catalytic behaviour
II. Coloured compounds
III. Variable oxidation states

  Chromium appears to the right of vanadium in the periodic esz 81g-c9g 6h+uvc(n vy2gnmtable, as shown below:c-e vg9vng mschyun+68(z12g

Which of the following statements is true?

  Which of the following salts would form coloured solutions when dissolved in wa iqe-2 o8b-3ad ga6zjuter? aiu 3gdazo-j8- 62ebq
I. $CuCl_2$
II. $ScCl_2$
III. $ZnCl_2$

  Which chemical equation represents the definition of first ionkn8;.fu6+ *eh4znymkiqnk4z ization energy?

  Which of the following ihl 24t;z,ijass NOT a potential component 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 dissol7-xg:xcnde7 ew;3 ef qv;dw4zved __________.

  Which element would havmfk*31ms ;-tw k8fnj me the least attraction for a shared pair of electrons in a covalent bond?tm1;8* nm- fwkkfjm3s

  Which of the following is NOT true of metz)e x7sr4l1x aals?

Iron is a magnetic element in the fm5idf xzz zwuy6gbo. s1--x; 0irst 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 dissolvq;l4.zhzd i h(ed in water would produce a solution that is:

  Metalloid elements play important roles in electronic components vjd nz5;(zyw:m-r9xa , such as solar cells and computer chips. Which of the following is the cor nj r;wdy(zx- zav:m59rect definition of a metalloid?

1.The valence electrons in I2IX​ are farther from their nuclei than t cstn*gb).9ap he valence els).bcgpat9* nectrons 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 high wz5tci-; ymd8 bq+i je9/q9(jw 2iiyrest first ionization energy?

  Which one of the following statements about ar6( mci33y/toa9ti8l k ao.sy z*or.mcids 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 decrea.8l gzjixg26b -ykb6v ses down the group. The two main factors causing this trend are:k jbz2i xv .-6ggby68l

  The electron affinity of carbonp ap gsursh;w;0 c0+g(xk* n-n 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 thec bjqqxm+ bm07dxtp10/ i3or 6 periodic table, some features of the outer electron shell remain consjm+ 1 prb7xq3om60q0cbxi/tdtant.

Which of the following is correct?

Scandium is a transition metaoy/h a5 l,z5:k j1taxcjzx/0cp/a 3mvl 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 corv: 4x2w7- ti, )wvq jrn(skaznonp:v0rect value of $x$ and the shape of the $Cu^{2+}$ complex, $[CuCl_4]^{x-}$?

Each element containe8zymm-ab5fsrul 3u:r)7+bou0 ;poas a different arrangement of electrons, and these electron configuratfsm;8u 5rl3rob-e b :yaz m 7up)a+0ouions can also be represented using orbital diagrams. Determine the identity of each element described 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 compound8iuot7w0u zk no1o:, s formed between lithium and nitrogen?

  Which of the following is the correct formula for strontwaa2 6yw7 3 jvggj.oh3ium sulfide?

  Metal M is in group 2 of the periodic table. Which isppwns0:d,o 9 t the correct formula?

  Metal M is in group 2 of the periodic table.:k*tzc)on )0k+ ckc/2uh apzybuge1jz v+x*6 Which is the correct formula?

  Atom X is an isotope of an alkali xht3 c uy0q.5)1ymbhkmetal. Which of the following is a possible symbol for atom 5u c 0 hkby3t.my)hq1xX?'

An atomic nucleus of element X is surrounded by electron shel94rbet fzu ci p6nkd+2lrc+40 ls, as shown below: kel+dtn0czp24 r4fucb+9 ri6

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 electrogk,9-mysr q)va8yo . zn configuration 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 with identicahei yo,75wq5do*ufq hf/d k*-l oxidation states?

  Which of the following statements regarding the periodic table.sn5 tkyp-t +w 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, sulfur and.v ynjyp;ucx31 zlc5( chlorine in no particular orden1l5;xv ( .ycyzcjpu3 r:
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 statementsc. e- te9ez;r0qx y1fr)zti;a 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 melti)y b1sjpwx6 )jha;d- wng points of elements are correct? x-;bwjp hdayj6)) sw1
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 seej.roqij9 uz 6uif-98 cond, fourteenth and sixteenth coluizjqe. 9fi8rjo9 uu -6mns 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 reacts with chlorine to g0)vns jux 4 yj342lcrproduce 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 zloc5q0y1 *d5tnhy2s($NH_3$​) 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 g 18kso5lpw)6mgh( dlc1 w i7t)mkbvc8roup 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 the periodic table m/2r*t ljx6jz yv51/ f8xnn qzis 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 to large *l9o:7slu9km r q9c/ojpk2fqst radius?

The oxides of two period 3 elements, X and Y, react in w ze).xv0tg2) vbc2rl tater according to the equati 2g2br)l t)cx .vez0tvons 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 energies (A(gey6 vas2-( ybzqc, kr()→$A^{+}$(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 of thhkr 0 8p+glz(ce following except:

  The oxidation number of X is the same in all the follow,s-8adybp2k2qcm7s z:v )pu sing compounds except:

The successive ionization energies gucr7 ;+ tktkbay) xoea3q770 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 increasing radius for these isoelectronic spe,omi fvhh6 o-* j6by6rei,r6r cies,fj6ri,o66 6rv -y horhmei*b?

The bidentate ligand6x x 0oojfj7l,, phenanthroline (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.