Isotopy/Radioactivity/Allotropy/Chemical Structures

Which of the following statements about isotopes is NOT true?

• Diseases can be diagnosed and treated using radioisotopes.

• The use of archaeological specimen can be determined using C-12 dating.

• In artificial pacemakers, plutonium-238 is used in the thermoelectric batteries.

• Nuclear power stations use the fission of uranium-235 as a source of energy.

The layer-like arrangement of graphite and the weak bonds between the layers determines that graphite is

• colourless and transmit light

• very hard with a high density

• greasy and used as a lubricant

• a good conductor of electricity

Which of the following statements would be correct if diamond and graphite are allotropes?

• Both can be represented by the symbol C.

• Both have a relative atomic mass equal to that of carbon.

• They have similar physical properties.

Which of the following pairs are isotopes?

• V and W

• W and Y

• X and V

• Y and X

Graphite is used as an electrode because it

• does not burn

• has mobile electrons

• is a metal

• is a reducing agent

An element, X, has 8 electrons in its outer shell. Which of the following are possible isotopes of X?

• 
• 
• 
• 

Which of the following elements exhibits allotropy?

• Silicon

• Carbon

• Uranium

• Aluminium

The element that is used to determine the relative atomic mass of other elements is

• Carbon-10

• Carbon-12

• Carbon-13

• Carbon-14

²⁴₁₁Na and ²³₁₁Na are isotopes because they

• conduct electricity

• react vigorously with water

• have the same relative atomic mass

• have the same number of protons

The only giant atomic structure that can conduct electricity is

• quartz

• copper

• graphite

• polyvinyl chloride