1. Which is the best description of a metallic bond?
The electrostatic attraction between...
A. positive and negative ions
B. shared pairs of electrons and the positively charge nucleus
C. positive ions and delocalized electrons.
D. atoms and delocalized electrons
2. Which statement is true?
A. Sodium has a stronger metallic bond than lithium
B. Potassium has a weaker metallic bond than calcium
C. The melting point of the alkali metals increases down the group
D. The melting point of the metals Na, Mg, Al decreases with atomic number
3. Which substance has a high melting point and conducts in the solid state?
A. potassium
B. diamond
C. silicon dioxide
D. copper
4. Which has the higher melting point, sodium or aluminium and why?
A. Aluminium because the aluminium ion has a greater charge
B. Aluminium because aluminium has a greater ionization energy
C. Sodium because sodium has a smaller electronegativity
D. Sodium because sodium has a larger atomic radius
5. Which statement explains why metals conduct electricity?
A. Metals have delocalized electrons which are free to move
B. Metals have layers of positive ions which can slide over each other
C. Metals have lower ionization energies than non-metals in the same period
D. Metals contain ions which are free to move
6. Steel is an alloy of iron and carbon. Which is true for steel?
A. Iron and carbon are chemically bonded
B. Steel is stronger than iron
C. Steel is more malleable than iron
D. Steel does not conduct electricity
7. Which diagram best represents a solid alloy?
8. Sodium, graphite and sodium chloride can all conduct electricity. What particles conduct the current through the substance in each case?
sodium
graphite
Sodium chloride
A
ions
electrons
ions
B
ions
ions
electrons
C
electrons
electrons
electrons
D
electrons
electrons
ions
9. A substance has a melting point of 1746°C. It does not conduct electricity when molten and is insoluble in water. What type of structure does the solid have?
A. simple molecular
B. ionic
C. giant molecular
D. metallic
10. Which statement correctly describes the trend in melting point of the elements across period 3 from Na to Cl?
