Which is NOT a characteristic property of metals resulting from m9 )8bd8 n+bou9wndb;l gyq238eonmvk etallic bonding88km)nubo9 ybw e8q+dg 2lb3non9d;v ?

Metallic bonding characterg )*slh,bpe 6;kw ho4/pu,alf izes the bonding present in the elemental form of the metals on twus /k;a)hpf l lphgeo4b,6,*he periodic table.
1.Describe features of metallic bonding.
2.Describe 3 common properties of metals that result from metallic bonding.
3.Solid sodium chloride is brittle while sodium metal is not. Explain this difference in properties.

  Metallic bonding is best chara q) f*p.ov.axucterized by the following statement:

  Which of the following is NOT true of metal2+.a thvw;i7tyxyn8zq9q/f ts?

Properties of substances can be related to the type of bonding, v)x( ;n c(nicr/n06m*v iibub including electrical condu xnrinim) u((;v6nvb*0 cbc/ictivity.
1.In part (a) of the table below, state examples of one metallic and one non-metallic substance that are electrically conductive.
2.In part (b) of the table below, draw a diagram that demonstrates the bonding of each substance mentioned in part (a).
3.In part (c) of the table below, state why this bonding structure enables electrical conductivity.

Non-metallic Metallic
(a)Substance with electrical conductivity
(b) Diagram or model of structure
(c) Reason for Conductivity

  Which characteristic best corresponds to, or indicates, the strength lq8a) ) *ylccdgfx- a1of metallic bonding?* x)a -aq18ldflc)cy g

Titanium, lithium, and potassium have melting poz tox0:v-xn l0ints of 1910$^{\circ}C$,181$^{\circ}C$,and 68$^{\circ}C$,respectively.
1.Outline two characteristics of a metallic element that affect the strength of the metallic bond.
2.In terms of atomic structure, the observed melting points of titanium, lithium, and potassium listed above.

  Based on periodic trends, which series correctly orders the ea g6trp vv k hnb.:r377/not6nlements by increasing melting p. n 7kt6:/t b7hrgnv36pavn rooints?

  The oxides of two period 3 elements, X and Y, react in water accor*g9 t7xvn:hehding to the equations below. *nx9gt 7h e:vh
I. $XO_{2(s})$ + $H_2O_{l}$→$H_2XO_{3(aq)}$
II. $YO_{2(s})$ + $H_2O_{l}$→$Y(OH)_{2(aq)}$
1.Identify elements X and Y. Element X is   ;Element Y is   .
2.Predict whether element X or Y would have a higher melting point. Element  ----待选择----XY  will have a higher melting point than element  ----待选择----XY 

  1.Explain the difference in physical properties of the fx;a1j bv,)y7mug+rtni ze1q 4m3y;jsollowing using knowledge of chz mjj1ysvnqm;1gue ),;+y a x7ti43rb emical structure and bonding:
.1.The boiling point of hydrochloric acid (HCl) is  ----待选择----lessmore  than that of lithium chloride (LiCl).
.2.Calcium bromide ($CaBr_2$)  ----待选择----cancannot  conduct electricity in a molten state and aqueous solution; Bromine ($Br_2$)  ----待选择----cancannot .
.3.The boiling point of HI is  ----待选择----lowerhigher  than $I_2X$.
2.Arrange bromine ($Br_2$), potassium and potassium bromide in order of increasing boiling points.
 ----待选择----brominepotassiumpotassium bromide ＜ ----待选择----brominepotassiumpotassium bromide ＜ ----待选择----brominepotassiumpotassium bromide 

  Which statements regarding metallic bondi2x/po xrb. f3zng are correct?
I.The higher the charge on the ion of a metallic element, the weaker the bond
II.A metallic element with a greater ionic radius will have a weaker metallic bonding
III.Metallic bond strength increases with the number of delocalized electrons

Lithium is a metal in group 1 of the periodic table. The gp -:y6pp v*1 t+epmosjroup 1 metals react with bromine to form soluble bromide sal1e:6p ytp j+mso *pv-pts, which all have the same lattice structure.
1.The melting points of the group 1 metals and their bromide salts are shown in the graph.


1.Explain the variation in the melting points of the group 1 metals.

2.The following diagram shows the electron density distributions formed when bromide ions interact with lithium and sodium ions.

Based on the diagram, suggest why the melting point of lithium bromide is lower than that of sodium bromide.
2.Lithium is a good electrical conductor, whereas lithium bromide is an electrical insulator.
.1.Explain the difference in the electrical conductivities of lithium and its bromide salt.
.2.Explain how water interacts with lithium bromide to produce an electrically conductive solution.

  Which of the following are charac,b7 54 / dh)bftx07 fpe7xbtkvotpio8teristics of transition elements?
I.High melting points
II.Soft
III.Electrically conductive

  Which of the following explains why transition metals have high melting points?

  Which of the following characteristics of transition metals results in high ele+ zoc/fjo)9xvgym2 ty:n5nr:n + hai 7ctri:m o7y n5/ :2zinaxgry+cvf9o+jhtn)cal conductivity?

  When comparing Ca to 83 4fd7)tsx )qaihxf t/ sbb;sNi, which of the following is true?

  Vanadium and titanium are both common metals in aerospacenxrs )7*dtgs:v8 x(px ;jr9blu .(mje engineering because they have a high strength to weight ra;m8d*:7x 9x((e x bvsjrr nslp.)gutjtio.
1.vanadium has a  ----待选择----higherlower  melting point than titanium.
2.Titanium and vanadium are both able to conduct electricity. Explain how this is possible.
3.Tin is not a good choice for use in aerospace engineering. Predict, with a reason, why this is so.