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Chemistry
3. Classification of Elements and Periodicity in Properties
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Q30 of 59 Page 32

Choose the correct order of atomic radii of fluorine and neon (in pm) out of the options given below and justify your answer.

(i) 72, 160


(ii) 160, 160


(iii) 72, 72


(iv) 160, 72


(i) 72, 160


EXPLANATION


Neon has vanderwaals radii and fluorine has covalent radii. Covalent radius is always less than vanderwaal’s radius, so the radius of Fluorine is 72pm and Neon is 160pm.


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28

Among the elements B, Al, C and Si,

(i) which element has the highest first ionisation enthalpy?


(ii) which element has the most metallic character? Justify your answer in each case.


29

Write four characteristic properties of p-block elements.

31

Illustrate by taking examples of transition elements and non-transition elements that oxidation states of elements are largely based on electronic configuration.

32

Nitrogen has positive electron gain enthalpy whereas oxygen has negative. However, oxygen has lower ionisation enthalpy than nitrogen. Explain.

Questions · 59
3. Classification of Elements and Periodicity in Properties
1 2 3 4 5 6 7 8 9 10 11 12 12 B 12 C 12 D 12 E 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55
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