Passage II
In the periodic table, a column of elements is called a group. For each of 5 elements in Group 2A and for each of 5 elements in Group 3A, Table 1 gives the atomic mass (average mass of 1 atom in atomic mass units, amu) and 3 other properties at a temperature of 298 K:
• density,
• specific heat (amount of heat required to raise the temperature of 1 g of a substance by 1 K),
• thermal conductivity (ability to conduct heat; the greater the thermal conductivity, the more effectively the substance conducts heat).
Figure 1 shows, for Al and for Mg, how the thermal conductivity varies between 1 K and 100 K.
10. Based on the definition of thermal conductivity and on Table 1, does strontium or thallium conduct heat more effectively at 298 K ?
Your Answer is
Correct Answer is H
Explanation
Looking at Table 1, the thermal conductivity of Thallium is 46.1, while that of Strontium is 35.3, so it should be that Thallium has higher thermal conductivity.