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a] What are metalloids? Write any two ex...

a] What are metalloids? Write any two examples.
b] Given below are some of the elements of the first group: Li, Na, K (their atomic numbers are 3, 11, and 19 respectively and they belong to 2nd, 3rd, and 4th period respectively). Arrange them in the decreasing order of their metallic character.

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a) Metallolds have properties in between those of metals and non-metals. Examples are silicon and germanium.
b) Li, Na, and K are placed in group one below the other. Since metallic character Increases down a group, K has the highest metallic character. Hence, in decreasing order of metallic character, the arrangement is: `K > Na > Li.`
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ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (SHORT ANSWER (SA) TYPE QUESTIONS)
  1. Name three elements with seven valence electrons in their outermost sh...

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  2. Inert gases are placed in a separate group in the Modern Periodic Tabl...

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  3. a] What are metalloids? Write any two examples. b] Given below are s...

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  4. a] Write the trend of atomic size and metallic character along a group...

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  5. a] Name the element with atomic number 17.   b]To which period does i...

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  6. Draw a part of the long form of the periodic table showing a non-metal...

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  7. (i) Predict which of the following elements will form cation and will ...

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  8. Write the name, symbol and electronic configuration of an element X wh...

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  9. The electronic configuration of an element is 2, 8, 4. State its i] ...

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  10. Can the following groups of elements be classified as Dobereiner's Tri...

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  11. An element 'X' has atomic number 13. a] Write its electronic config...

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  12. Choose from the following ""(6)C , ""(8)O, ""(10)N e, ""(11)Na, ""(1...

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  13. How does the valency of elements vary a) in going down a group b)...

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  14. How would the tendency to lose electrons change as you go i] from le...

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  15. i] Atomic radius of hydrogen is 37 pm. Express it in metres. ii] How...

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  16. Arrange the following elements in the descending order of atomic size ...

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  17. The position of elements A, B, C, D in the modern periodic table is gi...

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  18. ‘Hydrogen occupies a unique position in the Modern Periodic Table.' Ju...

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  19. Write the formula of the product formed when the element A (atomic num...

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  20. a) Discuss any two achievements of the Modern Periodic Table. b) Dis...

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