Which is NOT a characteristic propeng7sn(,ou:bts uu ,m6rty of metals resulting from metallic bondingsu6tb,us:o um7(gn ,n?

Metallic bonding characterizes the bonding presebht-a 4*heu wq3+,ynp/elcfma 3(fr8 nt in the elemental form of the metals on the periodic t38hlm(qftya e uab,r-*+nw43 /feph cable.
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 following sta zk vx0,5n+basn3,ztx +*zifq /ytw u+tement:

  Which of the following is NOT truobz,m2n/ma-1lv qw03z glft *e of metals?

Properties of substances can be related to the type of bonding, in0 s d fd/ba:tmr5qs*1gb6u5 bkcluding electricas:ar5 50b1btubs fddg6* km/ql 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 stren0 j5 btns.*gi3by uea3q,+)sjhb so+ ngth of metallict,0n3jubanb q hs5)jy3+s+ei.bs og * bonding?

Titanium, lithium, and potassiumwjmc6l3u.9zw 8xj,cd;r oe gxl : bb5/ 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 tren o8 cmw2o nwc8-l)4/spd0jbsrds, which series correctly orders the elements by increasing meltingcoplw4oc0 s)n 8-wj8ds/ br2m points?

  The oxides of two period 3 elements, X and Y,7y7o s:8h vxao react in water according to the equatioo8o7s7ha xvy:ns 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 pr2m )bw:h0gkq boperties of the following using knowledge of chemical structure an2mg h0 :bk)wqbd 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 regar r-:zgjpj. gkt(/z0uvd 3o(dsding metallic 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 group 1 metals real/j0etl1h u.mvs( km) ct with bromine to form soluble)l s/mjvl1t (kh meu0. 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 transition elemen-n n se-dl9npmydk z 3c(jac f7xny4)e;)bt-9ts?
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 r.p)o: fth- ;, f9niz)yjhr bcbesults in high electrical conductiv z)hoti;fy:.h-9r p,jf cbn)bity?

  When comparing Ca to Ni, which of t91zwu;4 je wos9zq c 4opdco+9he following is true?

  Vanadium and titanium are both common metals in aerospace engineering becausv*i24e rgtvvkhgdpqs7/+, eb*r 8mv:e they have a high strength to weight rs:gi42tk bvm her8 vedpq7 v, r+*g/*vatio.
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.