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In the periodic table the trend of densi...

In the periodic table the trend of density of elements down the group generally

A

increases

B

decreases

C

remains constant

D

first increases then decreases

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Density**: Density is defined as mass per unit volume (Density = Mass/Volume). Therefore, to analyze the trend of density in the periodic table, we need to consider how both mass and volume change as we move down a group. 2. **Effect of Atomic Size**: As we move down a group in the periodic table, the number of electron shells increases. This results in an increase in the atomic size of the elements. The larger the atomic size, the greater the volume of the atom. 3. **Effect of Atomic Mass**: Along with the increase in atomic size, the atomic mass of the elements also tends to increase as we move down a group. This is due to the addition of more protons and neutrons in the nucleus. 4. **Comparing Mass and Volume**: While both mass and volume increase as we move down a group, the increase in atomic mass is generally more significant than the increase in volume. This means that the density, which is mass divided by volume, tends to increase. 5. **Conclusion**: Therefore, the trend of density of elements down the group generally increases. This is because the increase in mass outweighs the increase in volume. ### Final Answer: The trend of density of elements down the group generally increases. ---
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