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JEE Advanced 2012Paper 1

Exam: JEE Advanced
Year: 2012
Paper: Paper 1
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Advanced 2012 · Paper 1 · Chemistry · Classification of Elements and Periodicity in Properties

The periodic table consists of 18 groups. An isotope of copper, on...

The periodic table consists of 18 groups. An isotope of copper, on bombardment with protons, undergoes a nuclear reaction yielding element

X

as shown below. To which group, element

X

belongs in the periodic table?

{ }_{29}^{63} \mathrm{Cu}+{ }_{1}^{1} \mathrm{H} \rightarrow 6_{0}^{1} n+{ }_{2}^{4} \alpha+2{ }_{1}^{1} \mathrm{H}+\mathrm{X}

Correct answer

8

Step-by-step solution

{ }_{29}^{63} \mathrm{Cu}+{ }_{1}^{1} \mathrm{H} \rightarrow 6{ }_{0}^{1} n+{ }_{2}^{4} \mathrm{He}+2{ }_{1}^{1} \mathrm{H}+{ }_{Z}^{A} X

Balancing the atomic mass and atomic number

63+1=(6 \times 1)+4+2+A \Rightarrow A=52

29+1=(6 \times 0)+2+2+Z \Rightarrow Z=26

Thus

{ }_{Z}^{A} X={ }_{26}^{52} X

or

{ }_{26}^{52} \mathrm{Fe}

Hence,

X

belongs to group 8 in the periodic table.

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