Which is NOT a characteristic property of metals resulting 1ea /ef qo1,i2ugw1iqfrom metallic bonding?2a11ueqo1qi ie/ fw ,g

Metallic bonding characterizes the bon;(u9q(yu :d mu ,cx c*zidtk9uding present in the elemental form of the metals onu(9m:xcdk,;zc t duqi9 yuu(* 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 the following statemeunao -w qe+o8j z/;vq(nt:

  Which of the following is NOT true of metals?jlx/d i.653ds( rdpup

Properties of substances can be related to the type of bonding, includ xdtxolci25pe9c x4/ :ex/5/d a vn*gcing electrical co*5 x:eglc c/9p/c /5iatn2 d ex4vxoxdnductivity.
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 corresponnr i7v 6esv-/fv*wy2v ds to, or indicates, the strength of metallic bonding? * 6-erv7iy wsvfvv2/n

Titanium, lithium, and potassium hdp*4n-g ; dhuove;d, qave 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 b mall.gk4z:-o y increasi .kamlg4o:-lzng melting points?

  The oxides of two period 3 elements, X and Y,e u.;v k(cliod-wn m;th/q55z react in water according to the equation5w;h .e-(/;5ltcid vqzu k omns 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,,e6lypc *p rl physical properties of the following using knowledge of chemical struc*y ,,lppr6 elcture 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 u5kdhw.9g,-fk 8 vxvhbonding 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 0.,lebyrz7r h ktd /,xthe periodic table. The group 1 metals react with bromine to form solb ld0rkrt7e.x/,z yh,uble 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 kn ig,o6rc5n k:s1bi,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 f-cv(s p0mx u.wpi/ lymm33* helecm3p yicp v m3*fx.sh0m/(-luw trical conductivity?

  When comparing Ca to Nyy-a77bitd oe: oi3d9 i, which of the following is true?

  Vanadium and titanium are both common metals in aerospace engineering becau wjl l.4m .v;fbp5kn0pse they have a high str b.plkfnvw 4j5l.m;p0 ength to weight 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.