The chemical species having same number of electrons in the outermost and penultimate shell is
A. `O^(2-)`
B. `Na^+`
C. `Cl^-`
D. `Al^(3+)`
1 Answers
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The halogen having five vacant orbitals in the outermost shell belongs to
Correct Answer - A Five vacant orbitals (3d-level) are present in Cl `(1s^2 2s^2 2p^6 3s^2 3p^5)` which belongs to 3rd period.
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In 4-f series penultimate shell contain how many electrons ?
Correct Answer - A We know that, in 4f series penultimate subshell is d. Which contains 0 to 1 electrons
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In 4-f series anti penultimate shell contains how many electrons ?
Correct Answer - A We know that, in 4f series antepenultimate orbital is 4f. It contains 1 to 14 electrons.
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The most common oxidation state of an element is `-2`. The number of electrons present in the outermost shell is
Correct Answer - C Since the common oxidation state of metal is -2. This indictaes it is 2 electrons short of noble gas configuration. Therefore, it has six electrons in valence...
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An atom of the element A has 3 electrons in its outermost shell while another atom X has 6 electrons in its outermost shell. The formula of the compou
Correct Answer - C Valency of A is 3 and that of X is (8-6), i.e.2
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The energy of an element with a vacancy in K-shell is 35.2 V, in L-shell is 5.25 keV and in M-shell is 0.55 keV higher than the energy of the atom of
It is given that, `E_(K)=35.2keV,E_(L)=5.25keV,E_(M)=0.55 keV` `rArr" " E_(K)-E_(L)=(hc)/(lambda_(K_(A_(alpha))))=hv_(K_(alpha))` `rArr(35.2-5.25)xx10^(3)xx1.6xx10^(-19)=6.6xx10^(-34)v_(K_(alpha))` `rArr" " v_(K_(alpha))=(29.95xx10^(3)xx1.6xx10^(-19))/(6.6xx10^(-34))=7.2xx10^(-34)Hz` Similarly, `E_(K)-E_(M)=hv_(K_(beta))` `rArr" " v_(K_(beta))=((35.2-0.55)xx10^(3)xx1.63xx10^(-19))/(6.6xx10^(-34))=8.4xx10^(18)Hz` Also, `E_(L)-E_(M)=hv_(k_(alpha))` `rArr" " ((5.25-0.55)xx10^(3)xx1.6xx10^(-19))/(6.6xx10^(-34))=1.1xx10^(18)Hz`
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The orbital angular momentum of electron in the `n_(1)th` shell of element of atomic number `Z_(1) is L_(1)` an the same in the `n_(2)th` shell of ele
Correct Answer - A `L=(nh)/(2pi)` it does not denpend on Z
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An ion having a 4+ charge and a mass of 51.99 amu has two electrons with n=1,eight electrons with n=2,and ten electrons with n=3.Give the total number
Correct Answer - 24 In `M^(4+)` ion total number of electrons =20 Electronic configuration `=(1s^2)/2 (2s^2 2p^6)/8 (3s^2 3p^6 3d^2)/10` Number of electrons in metal = number of protons =4+20=24
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Which of the following noble gases does not have an octer of electrons in its outermost shell ?
Correct Answer - D Helium has only two electrons in its valence shell. On the other hand all other noble gases have 8 electrons in their valence shell.
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An ion has 18 electrons in the outermost shell it is
Correct Answer - A (a) The electronic configuration of Cu, Th, Cs and K are Cu(29) = 2, 8,, 18, 1 `Cu^(+) = 2,8,18` Th(90)= 2, 8, 18, 32, 18, 10,...
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