Which one of the following properties is not characteristic of typical metals?A. moderately high melting pointB. high boiling pointC. BrittlenessD. good electrical conductor as soon as solid E. excellent electrical conductor as soon as molten
Which among the complying with properties is least characteristic of typical ionic compounds?A. high melting pointB. high boiling pointC. brittlenessD. bad electric conductor as soon as solidE. negative electric conductor once molten
The melting points of Li and also Be are 180 °C and 1287 °C, respectively. Briefly account for these loved one values.

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Accoring to the electron sea model, the properties of metals depend on the regularity of the metal-ion variety and also the number and mobility of valence electrons.Metals melting points are moderately high because cations can move without distrupting their attraction to the bordering electrons. Be has 2 valence electrons compared to Li, which has just 1 valence electron per atom. According to the Coulomb"s regulation, their +2 cations have actually stronger attractions to twice as many type of valence electrons. Attraction rises via better ionic charge and also decreases with larger ionic radius.
Ionic compounds usually conduct electrical power....A. once in the solid stateB. only as soon as moltenC. once in aqueous solution or moltenD. only when in aqueous solutionE. once a solid or in aqueous solution
When metallic magnesium is dedeveloped, the steel ions do not repel each other. Ions are disput and also pass over one one more while still being tightly held by the attactractivity of the sea of electrons. Thus metals dent and bfinish.But in ionic MgF2, the ions are disput so that repulsive pressures between neighboring ions of choose charge reason smashing of crystals.

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the power of attractivity (or repulsion) in between two pshort articles is directly proportional to the product of the charges and inversely proportional to the distance between them.
Proposes that all steel atoms in a metallic solid add their valence electrons to form a "sea" of electrons; very delocalized and tempt all the metal cations



Chemistry: The Central Science1fourth EditionBruce Edward Bursten, Catherine J. Murphy, H. Eugene Lemay, Matthew E. Stoltzfus, Patrick Woodward, Theodore Brown