本题目来源于试卷: Models of Bonding & Structure B.3 The Metallic Model，类别为 IB化学
[问答题]
Titanium, lithium, and pota (:h+vc 5j e9/y4rbxd byjf:upssiga*5x ,a eft32v3tw tzte lx54um 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.
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