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• Which elements are present at extreme left side of a periodic table?
  
• Periodic Table Trends 1. What is the trend in ionic radius across a period? Down a group? 2. What is the trend in electronegativity across a period? Down a group? Using your knowledge of atomic structure, what the explanation for this trend?
  
• Concentrated sulphuric acid should not be used while preparing hydrogen gas in laboratory. Why ?
  
• What intermolecular forces are present in #NH_3#?
  
• Which of the four fundamental forces is mainly responsible for contact forces?
  
• How do you simplify #""^3sqrt{\frac{16x^5}{135y^4}}#?
  
• What is the difference between fusion, diffusion and osmosis?
  
• Identify the element indicated by each electricity configuration how do you do it?
  
• Melinda is practicing her penalty kicks. She took 40 shots and only missed 8. Based on the data, how many penalty kicks will Melinda make if she takes 60 shots?