Which is NOT a charactee hfv*gz+hj;+b+zyfl(7kj(c ristic property of metals resulting from metallic bonding?( k zygv+ef+ ;j7(zjlchh*f+b

Metallic bonding characterizes the bonding preqpm 0vn6c( o+isent in the elemental form of the metals on the periodic tablqov6p0 +cm(in e.
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 characterized by the folvktxjr( *, u(d3+ 5nvke 1jdtblowing statement:

  Which of the following is NOT true of metns51zmtd nwwx.8pi.o7 h,6 yvals?

Properties of substances can be relatedgvxa6l0q1 e;j to the type of bonding, including electrical1l0q6j ge vxa; conductivity.
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 streny3l c:)atv gr em-d,0s vpf3.ix1qgu;u;x9 wl gth of metallic bm 0i 9pld3;1,x v;-r sceu:qa xgfuw3)vty.lgonding?

Titanium, lithium, and potassium hohc3h-is0scn5 4 ffe* ave melting points 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 elements by dyh1i/c1j 9hhd/-lyn increasing melting pcjilhh-/d19h n1 y/dyoints?

  The oxides of two period 3 elements, X and Y, react in water according to ts-w2zjj 7 wxu-jlcs :z fi4i2 c0+aid,he equations below.-,u20sc d i7+z jj -wjwcf:axsi4l2z i
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 physiyouj4qwgon 9md2, z;9 fa:: sjcal properties of the following using knowledge of chemical structure and bonding: ;o ndg wa2 4so9yujqjm:f9,z:
.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 metalli kw)a,l lc5- x g(k x3fpbbazn79ho9p-c bonding 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 grouo2*askvp26fs+ r ljd +p 1 metals react with bromin2d2+ k +s6opajfr* slve to form soluble bromide salts, 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 characteristics of tra3 7yrn i6v4xuz9azj qp.ku**nf 6v 2csnsition 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 char*qsp) pfvu-8.-xmje kacteristics of transition metals results in high electrical coj*vs- 8epq p.k)m-xfunductivity?

  When comparing Ca to Ni, which of the following is try,x(b gax/ hd/;f e6oiue?

  Vanadium and titanium are botwbh-ecqan/qjw(6- e 3h common metals in aerospace engineering because they have a high strength to weneqhe aj/b--c q6w3( wight ratio.
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.