Which of the statements below gives a correul ztek*2:t;:7 yef h(wk0riz ct feature of a ligand?

  Which of the following can behavf 1mop1b*o( kp,omd: j z1e3lne as a ligand?
I. $BH_3$
II. $NH_3$
III. $CH_4$

  An outline of the pern .d l)uce*;amy .v)z p/nkvq8iodic 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 transiti3d vwuk 2xjo/etjjkxek kx61,s 3(6 l6on metals?
I. Catalytic behaviour
II. Coloured compounds
III. Variable oxidation states

  Chromium appears to the right of vanadium in agah5py2l5( lthe periodic table, as shown below: ( 5l2ag5pylah

Which of the following statements is true?

  Which of the following salts would form cb- o -1co:thnpoloured solutions when dissolved in wat hbco 1o-npt:-er?
I. $CuCl_2$
II. $ScCl_2$
III. $ZnCl_2$

  Which chemical equation represents the definition of first ionization ene n-3cuhus41roet/sl 5*jvb; grgy?

  Which of the following is NOT a potentia7r 2/jq q0mqsy8lm0ff l 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 dissolved+l+ky . bxu qr0mor w*z5-hftk qss*:( __________.

  Which element would ha c bzlg w49yyz6evlz:+. i18bwve the least attraction for a shared pair of electrons in a coval:cwl1b+zez y6b wl 4 zg9iv8y.ent bond?

  Which of the following 9+5w uvwofb29s)lp7ugfw.jv is NOT true of metals?

Iron is a magnetic element in the first r),rnl6 irbrp3aeoo1 - ow 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 d nbth/vw 0phv w(tto9mb30v, +9qnc1vissolved in water would produce a solution that is:

  Metalloid elements ploggu(v ,h( zgg7xur l mz8 -itr(-.6tmay important roles in electronic components, such as solar cells and computer chips. Which of the following is the correct definition of a metalloid? -gug8 g,lv6mt( ru(ot(7rgxz-m .z hi

1.The valence electrons in I2IX​ are+2dxy*9 3kf6vgk y-wt 5ayo6uqfupg/ farther from their nuclei than the valence electrons i 9 y*+f5y3ydvp g/ wt66o gxku2a-fqkun $Cl_2$. 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 ionizatih7+pj3 .;tnpqkf;da non energy?

  Which one of the following statements about2(6ickqq,zvmqdi r5 mmyg v69-bs+)o 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 gro lpm, f l*;8tve:qi;db49kwpoup. The two main factors causing this trend opqw ;lt8kf4*die lm9:v p;,b are:

  The electron affinity-i dn-7poka4. dnnjd 1 of carbon 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, some featu6g2 p+ed t nf r3qd.*exwuxjw8s3*.d eres of the outer electron shell remd jp rx8e* 2+es.wng.*qefxw 6u3ddt3 ain constant.

Which of the following is correct?

Scandium is a transition metal tha55 *vtu+pwmph9 vcxw;t 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 corr )0(h pz7k:xerqlp* knect correct value of $x$ and the shape of the $Cu^{2+}$ complex, $[CuCl_4]^{x-}$?

Each element contains a different arrangement 5psxbus4r 9vv /.-wxyof electrons, and these electron configurations can also be represented using orbital diagrams. Determine the iyrsxwv/.95vusxp-b 4 dentity 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 compound formed between lithiu:b /y0ijrydvuu*u6i. wl- sf7m and nitrogen?

  Which of the following is the correct f ib3-i 3/*g i3,sf tmf 4tma(gkiwnun1ormula for strontium sulfide?

  Metal M is in group 2 of the periodic table. Which is the correct foran((dsgn-jg7n 3vx8x- /w z vemula?

  Metal M is in group 2 of the periodic table. Which is the correct formulai 8*p8bh:kzivn 5e da)?

  Atom X is an isotope of an alkali metal. Which of the90 cn (ebc4he9 3bmue0yb a,fw following is a possible symbol cnb0(ey4wb 93,aub h0cf em9e for atom X?'

An atomic nucleus of element X is surrounded by electron shells, as shown8vf lep.)uby -m*8k fi below: yv*m)u. -kl8efi8pfb

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 ato/ m n1g-k jt)j0nik;dcuqv9v7 m 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 oxidatr ajlxbj0/c jl gn)c6sn:9 4cgj ,5cy2ion states?

  Which of the following statements w - 3kvh iyr he,:vs*c-84jyhsregarding 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, sulfur and t d:wpixq o./dhfo;1* chlorine in no particulard;.f*t o1hw:q/d opxi 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 mectyc:5lm1/ep,9 dd7jfx p1 m rtals?
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 poinqcw c a0gr55a vcvhzfh*(;/t1ts of elements are correct?/fwc5acvhgv0tqh1 (r 5z*c ;a
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, p0d(6t3b45v iq mb vdlsilicon and sulfur are found in the second, fourteenth a( 3 bmqld40i6 dbvptv5nd 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 tk d,)vnc+-g h5was 0lghat reacts 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 ammoni vtwb 8;+ydiu5a ($NH_3$​) 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 of thee.bjbukp 99 76xy dqqrrx 34m/ 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 ta:7e r-4o2o), 2vhmc*mdb sjts mzwl7he 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 toxr5yp6vkgz2ru f/ jbi)+y+y) largest radius?

The oxides of two period 3 elements, X and Y, 6v y- x89bsxyv4 vp/c56v fl .ecfzn+sreact in water according to the equativ8svzbvyfnfe/c5l p +s4y.9 x6x c6v-ons 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 ionizhd: b0e g6b ,d43q0 vmn(yicgzation 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 inb6e8fqw +) n9sr2x: t ttd4znn all of the following except:

  The oxidation number of X is the same in alckw 31u(n3 w) nzci3wzcdhh,,mv :kf0l the following compounds except:

The successive ioniz.;dx:f nsz qc)ation energies 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 increase(v dcp2;8p bq0qmw a:)n wfl+ing radius for these isoelectronic speci8 n p02+q(;f pd)w:e qmablwvces?

The bidentate ligand, phenanthroline (phen) has thk wo. 6dac(b5be 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.