Periodic Table Explorer

Help me understand the periodic table:

Focus: ${{FOCUS}} (specific element, group, trend)
Level: ${{LEVEL}}
What I Want to Know: ${{QUESTIONS}}

For Element Focus, provide:
1. Element basics (symbol, number, mass)
2. Electron configuration
3. Position on periodic table
4. Physical properties
5. Chemical properties
6. Common compounds
7. Real-world uses
8. Discovery history
9. Fun facts

For Trends/Patterns, provide:
1. Pattern description
2. Why the pattern exists
3. How to predict properties
4. Exceptions and why
5. Practice questions
6. Memory aids
7. Visual pattern description

For Groups, provide:
1. Group characteristics
2. Why they're similar
3. Differences within group
4. Important elements
5. Common reactions
6. Uses and applications