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Question
This table shows the mass of one atom for five chemical elements. Use it to answer the question given.
| Element | Mass of atom (kg) |
| Titanium | 7.95 × 10–26 |
| Lead | 3.44 × 10–25 |
| Silver | 1.79 × 10–25 |
| Lithium | 1.15 × 10–26 |
| Hydrogen | 1.674 × 10–27 |
- Which is the heaviest element?
- Which element is lighter, Silver or Titanium?
- List all five elements in order from lightest to heaviest.
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Solution
Arrangement of masses of atoms in same power of 10 is given by
Titanium = 7.95 × 10–26
Lead = 34.4 × 10–26
Silver = 17.9 × 10–26
Lithium = 1.15 × 10–26
Hydrogen = 0.1674 × 10–26
Thus, we have 34.4 > 17.9 > 7.95 > 1.15 > 0.1674
a. Lead is the heaviest element.
b. Silver = 17.9 × 10–26 and Titanium = 7.95 × 10–26, so titanium is lighter.
c. Arrangement of elements in order from lightest to heaviest is given by
Hydrogen < Lithium < Titanium < Silver < Lead
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