Which is NOT a characteristic properxxr7.d ,co+j, e hdt43cn7zr tty of metals resulting from metallic bonding, d7cx tcro r ,dxzj+3n4t.7he?

Metallic bonding characterizes the bonding prexqtt /a7q .c:lsent in the elemental form of the metalxq tt lqa/:.7cs on the 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 characterized by.4xtm 75v+ij bp vz7ju the following statement:

  Which of the following is NOT thov.5hntuv(5 66 z grerue of metals?

Properties of substances can be related to thc (p28uoqlv c2e type of bonding, including electricac ( l2uocv28pql 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 strength of me+n -cbmcqa9+ w) uu-titallic bo+tc+m 9uc-)qb nwai -unding?

Titanium, lithium, and potassi fcc z1xhz:c+hu x(::*go+mudum have 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 sq oco)g:lt7rf;+s9- mfza :ywc+o5/fzcju 0 the elements by increasing0:+t)7fsz /z9 rq g:5+ojfy;sa uc lcowcofm- melting points?

  The oxides of two period 3 element fkext d03h9 ,5bq9lwts, X and Y, react in water according to the eql9qkb9 x,35fht0 de twuations below.
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 following using knowledge*uudm uyo ,6a+mo;fmn i2+3wd of chemical structure and bondf*,63u m i+;o oumuwnm+2aydding:
.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 metmdh9bop5dnt 8p k)uq6 25pqw )rze7h4/am+exallic 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 f y33el33vbjc table. The group 1 metals react with bromine to form soluble bromide salts, which all have the same lv3c l3y 3eb3jfattice 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 tranzajwdl1 r z fl/pt1*8.sition 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 el/g, amw2vdnl ,ectricalmdagw/n, 2 lv, conductivity?

  When comparing Ca to Ni, which oc3)wlr 5/ 5hojj ay gk., 2j(hprzk;yff the following is true?

  Vanadium and titanium are both common metals in aerospace engineering bak3 if.1uxb z;(ycc dbh(lfwkg9b.u: 84v:knecause they have a high strength to xk:c: g ak d bbh w.1ub9 .v(kl8uzfn(i3;y4fcweight 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.