Why would it be difficult to decide weather or not an element was a metalloid?

Why would it be difficult to decide weather or not an element was a metalloid?
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1. By which an element is best characterized? 2. Which is the maximum spoken language in the world? 3. Which is the longest passenger rail route in India? 4. Daily weather map showing isobars is an example of which map? 5. Which was not included in the Eight Fold Path prescribed by Buddha?

Description : 1. By which an element is best characterized? 2. Which is the maximum spoken language in the world? 3. Which is the longest passenger rail route in India? 4. Daily weather map showing isobars ... very high velocities in certain parts of the atmosphere? 20. By whom was Din-i-Ilahi was accepted?

Last Answer : Answer : 1. By its atomic number 2. Mandarin 3. Kanyakumari and Jammu Tawi 4. Chropleth map 5. Right knowledge 6. Birds 7. Bombay, Madras, Calcutta 8. Gamma rays 9. 2700 and 4000 metres 10. Pali 11. ... 14. One day 15. Sher Shah Suri 16. Parliament 17. Sodium 18. Egypt 19. Jet stream 20. Birbal