A. They can be melted at high temperatures, so that their electrons becomes mobile to conduct electricity
B. They can dissolve in certain liquids that move their electrons around for electric conduction
C. Their electrons can move around so easily inside metals
D. All of the above
Answer: C
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A. There are no free electrons or ions in any state to carry electric charge
B. They do not dissolve in liquids which helps to make their ions mobile and able to conduct electric
C. They are mainly gases and liquids
D. They are polymers
Answer: A
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A. The sodium atom will loss one electron to give Na+, and the chlorine atom will gain that electron to give Cl-, the resulting ions, which have opposite charges will be attracted to one another
B. The chlorine atom will loss one electron to give Cl+, and the sodium atom will gain that electron to give Na+, the resulting ions, which have opposite charges will be attracted to one another
C. Sodium atom and chlorine atom will share their valence electron in the highest principal quantum number to attain octet
D. Sodium atom will donate the electron in its highest principal quantum number, and share with chlorine atom, so that both attain octet
Answer: A
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A. High heat of formation
B. Strong bonding force which extends throughout the crystal in all directions
C. High lattice energy
D. Presence of charged particles
Answer: B
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A. They are non metals
B. The ions are free to move to carry an electric current
C. The ions are not free to move to carry an electric current
D. Because they are not volatile
Answer: C
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Universities of the Coimbra Group offer short-term visits (generally 1 to maximum 3 months) to young African researchers from higher education institutions from Sub-Saharan Africa. The main aim of ...
