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Chemical Bonding and Molecular Structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryChemical Bonding and Molecular Structure3 Marks
Question
  1. Determine group and block of elements with atomic number 29 and 35.
  2. Define $\pi$ bonds.
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Answer

  1. $\text{Cu}(29):\text{ls}^2\ \text{2s}^2\ 2\text{p}^6\ 3\text{3s}^6\ \text{4s}^1\ \text{3d}^{10}$
It belongs to group 11, $4^{\text {th }}$ period and d-block of periodic table.

$\text{Br}(35):\text{ls}^2\ \text{2s}^2\ 2\text{p}^6\ 3\text{s}^2\ 3\text{p}^6\ 4\text{s}^2\ 3\text{d}^{10}\ 4\text{P}^5$

It belongs to Group 17, $4^{\text {th }}$​​​​​​​ period and p-block of periodic table.
  1. $\pi-\text{bond:}$ It is formed by lateral or sideways overlapping of parallel p-orbital above and below the plane of inter nuclear axis.

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