Chemistry Classification of Elements and Periodicity in Properties

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A
alok kumar singh

Contributor-Level 10

Krypton (Kr)  belongs to the zero group element as per Mendeleev's periodic table.

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alok kumar singh

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Group?17, elements have very high ionisation enthalpy due to increase in atomic size, ionization enthalpy decreases down the group.

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

 

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alok kumar singh

Contributor-Level 10

Element        V

Ti

Cr

Mn

IE2 (kJ/mol) 1414

1309

1592

1509

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

Z=109 : Unnilennium->Meitnerium

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alok kumar singh

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Sn = [Kr]4d105s25p2

Sn (Z = 50) belongs to p-block element.

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alok kumar singh

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Element/ion

DegH (kJ mol–1)

O

–141

Na

–53

Cl

–349

O–

+780

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alok kumar singh

Contributor-Level 10

Correct order of atomic radii is Tl > In > Al > Ga > B

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alok kumar singh

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Li+ has the largest size in aqueous solution due to its high polarising power.

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V
Vishal Baghel

Contributor-Level 10

s – block and p – block elements together are called as representative elements.

Zn (Z = 30) is a d-block element.

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