(Answered) Q1 how the groups are numbered in modern periodic tableq2

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Q1. How the groups are numbered in modern periodic table?

Q2. How the groups were numbered in periodic table of American system of naming?

Q3. How the groups were numbered in periodic table of European system of naming?

Q4. Do the groups from 3-10 have any trivial names?

Q5. Which properties show pattern in periodic table?

Q6. How the atomic radii show variation from top to bottom?

Q7. How the ionization energy varies in moving down the group from top to bottom?

Q8. How the electronegativity varies in moving down the group from top to bottom?

Q9. What was the position of noble gases in original form of Mendeleev's periodic table?

Q10. What is the position of hydrogen element in the modern periodic table?

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