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"Periodic Trends Worksheet", which contains questions about periodic trends in the periodic table, such as atomic radius, ionization energy, electronegativity, and electron affinity.
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periodic trends problems.
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🔍 Common Periodic Trends Explained:
Here are the key periodic trends and how they change across the periodic table:
| Trend | Across a Period (Left → Right) | Down a Group (Top → Bottom) |
|------|-------------------------------|-----------------------------|
|
Atomic Radius | Decreases | Increases |
|
Ionization Energy | Increases | Decreases |
|
Electronegativity | Increases | Decreases |
|
Electron Affinity | Generally increases (with exceptions) | Decreases |
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✔ Example Problem & Solution:
Let’s assume one of the questions is:
>
Which element has the largest atomic radius: Na, Mg, Al, Si?
#### Step-by-step solution:
- All these elements are in
Period 3.
- As we move from
left to right across a period, atomic radius
decreases due to increasing nuclear charge pulling electrons closer.
- So:
Na > Mg > Al > Si
✔ Answer: Sodium (Na) has the largest atomic radius.
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Another example:
>
Which has the highest ionization energy: O, F, Ne?
- These are in
Period 2, moving left to right.
- Ionization energy increases across a period.
- But
Neon (Ne) is a noble gas with a full valence shell — very stable.
- So it has the
highest ionization energy.
✔ Answer: Neon (Ne)
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