307301
Assertion : Ground state configuration of \(\mathrm{Cr}\) is \(3 \mathrm{~d}^{2} 4 \mathrm{~s}^{1}\). Reason : A set of half filled orbitals containing one electron each with their spin parallel provides extra stability to the system.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The ground state electron configuration of Chromium \((\mathrm{Cr})\) with an atomic number of 24 , is \([\mathrm{Ar}] 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{1} \text { So option (4) is correct. }\)
CHXI02:STRUCTURE OF ATOM
307302
The correct set of quantum number for the unpaired electrons of the chlorine atom is
1 \({\rm{2,0,0}}\,{\rm{ + 1/2}}\)
2 \({\rm{3,0,0,}}\,{\rm{ \pm 1/2}}\)
3 \({\rm{2,1, - 1 + 1/2}}\)
4 \({\rm{3,1, - 1 \pm 1/2}}\)
Explanation:
Electronic configuration of \({\rm{Cl(Z = 17)}}\) atom:\({\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{p}}^{\rm{6}}}{\rm{3}}{{\rm{s}}^{\rm{2}}}{\rm{3}}{{\rm{p}}^{\rm{5}}}\) So, the unpaired electron of Cl atom is in 3p-orbital. Hence, quantum numbers for unpaired electron; \({\rm{n = 3,l = 1}}\) (for p-orbital) \({\rm{m = + 1,0, - 1}}\) and \({\rm{s = \pm 1/2}}\) Thus only possible set is \({\rm{3,1,1, \pm 1/2}}{\rm{.}}\)
KCET - 2017
CHXI02:STRUCTURE OF ATOM
307303
The number of unpaired electrons in carbon atom is
1 \({\rm{2}}\)
2 \({\rm{4}}\)
3 \({\rm{1}}\)
4 \({\rm{3}}\)
Explanation:
Electronic configuration of carbon is \({\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{p}}^{\rm{2}}}\). The number of unpaired electrons in C is 2, i.e., in \({\rm{2p}}\).
307301
Assertion : Ground state configuration of \(\mathrm{Cr}\) is \(3 \mathrm{~d}^{2} 4 \mathrm{~s}^{1}\). Reason : A set of half filled orbitals containing one electron each with their spin parallel provides extra stability to the system.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The ground state electron configuration of Chromium \((\mathrm{Cr})\) with an atomic number of 24 , is \([\mathrm{Ar}] 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{1} \text { So option (4) is correct. }\)
CHXI02:STRUCTURE OF ATOM
307302
The correct set of quantum number for the unpaired electrons of the chlorine atom is
1 \({\rm{2,0,0}}\,{\rm{ + 1/2}}\)
2 \({\rm{3,0,0,}}\,{\rm{ \pm 1/2}}\)
3 \({\rm{2,1, - 1 + 1/2}}\)
4 \({\rm{3,1, - 1 \pm 1/2}}\)
Explanation:
Electronic configuration of \({\rm{Cl(Z = 17)}}\) atom:\({\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{p}}^{\rm{6}}}{\rm{3}}{{\rm{s}}^{\rm{2}}}{\rm{3}}{{\rm{p}}^{\rm{5}}}\) So, the unpaired electron of Cl atom is in 3p-orbital. Hence, quantum numbers for unpaired electron; \({\rm{n = 3,l = 1}}\) (for p-orbital) \({\rm{m = + 1,0, - 1}}\) and \({\rm{s = \pm 1/2}}\) Thus only possible set is \({\rm{3,1,1, \pm 1/2}}{\rm{.}}\)
KCET - 2017
CHXI02:STRUCTURE OF ATOM
307303
The number of unpaired electrons in carbon atom is
1 \({\rm{2}}\)
2 \({\rm{4}}\)
3 \({\rm{1}}\)
4 \({\rm{3}}\)
Explanation:
Electronic configuration of carbon is \({\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{p}}^{\rm{2}}}\). The number of unpaired electrons in C is 2, i.e., in \({\rm{2p}}\).
307301
Assertion : Ground state configuration of \(\mathrm{Cr}\) is \(3 \mathrm{~d}^{2} 4 \mathrm{~s}^{1}\). Reason : A set of half filled orbitals containing one electron each with their spin parallel provides extra stability to the system.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The ground state electron configuration of Chromium \((\mathrm{Cr})\) with an atomic number of 24 , is \([\mathrm{Ar}] 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{1} \text { So option (4) is correct. }\)
CHXI02:STRUCTURE OF ATOM
307302
The correct set of quantum number for the unpaired electrons of the chlorine atom is
1 \({\rm{2,0,0}}\,{\rm{ + 1/2}}\)
2 \({\rm{3,0,0,}}\,{\rm{ \pm 1/2}}\)
3 \({\rm{2,1, - 1 + 1/2}}\)
4 \({\rm{3,1, - 1 \pm 1/2}}\)
Explanation:
Electronic configuration of \({\rm{Cl(Z = 17)}}\) atom:\({\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{p}}^{\rm{6}}}{\rm{3}}{{\rm{s}}^{\rm{2}}}{\rm{3}}{{\rm{p}}^{\rm{5}}}\) So, the unpaired electron of Cl atom is in 3p-orbital. Hence, quantum numbers for unpaired electron; \({\rm{n = 3,l = 1}}\) (for p-orbital) \({\rm{m = + 1,0, - 1}}\) and \({\rm{s = \pm 1/2}}\) Thus only possible set is \({\rm{3,1,1, \pm 1/2}}{\rm{.}}\)
KCET - 2017
CHXI02:STRUCTURE OF ATOM
307303
The number of unpaired electrons in carbon atom is
1 \({\rm{2}}\)
2 \({\rm{4}}\)
3 \({\rm{1}}\)
4 \({\rm{3}}\)
Explanation:
Electronic configuration of carbon is \({\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{p}}^{\rm{2}}}\). The number of unpaired electrons in C is 2, i.e., in \({\rm{2p}}\).
307301
Assertion : Ground state configuration of \(\mathrm{Cr}\) is \(3 \mathrm{~d}^{2} 4 \mathrm{~s}^{1}\). Reason : A set of half filled orbitals containing one electron each with their spin parallel provides extra stability to the system.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The ground state electron configuration of Chromium \((\mathrm{Cr})\) with an atomic number of 24 , is \([\mathrm{Ar}] 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{1} \text { So option (4) is correct. }\)
CHXI02:STRUCTURE OF ATOM
307302
The correct set of quantum number for the unpaired electrons of the chlorine atom is
1 \({\rm{2,0,0}}\,{\rm{ + 1/2}}\)
2 \({\rm{3,0,0,}}\,{\rm{ \pm 1/2}}\)
3 \({\rm{2,1, - 1 + 1/2}}\)
4 \({\rm{3,1, - 1 \pm 1/2}}\)
Explanation:
Electronic configuration of \({\rm{Cl(Z = 17)}}\) atom:\({\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{p}}^{\rm{6}}}{\rm{3}}{{\rm{s}}^{\rm{2}}}{\rm{3}}{{\rm{p}}^{\rm{5}}}\) So, the unpaired electron of Cl atom is in 3p-orbital. Hence, quantum numbers for unpaired electron; \({\rm{n = 3,l = 1}}\) (for p-orbital) \({\rm{m = + 1,0, - 1}}\) and \({\rm{s = \pm 1/2}}\) Thus only possible set is \({\rm{3,1,1, \pm 1/2}}{\rm{.}}\)
KCET - 2017
CHXI02:STRUCTURE OF ATOM
307303
The number of unpaired electrons in carbon atom is
1 \({\rm{2}}\)
2 \({\rm{4}}\)
3 \({\rm{1}}\)
4 \({\rm{3}}\)
Explanation:
Electronic configuration of carbon is \({\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{2}}{{\rm{p}}^{\rm{2}}}\). The number of unpaired electrons in C is 2, i.e., in \({\rm{2p}}\).
