Long Answer TypeWrite down the electronic configuration of elements from atomic number 21 to atomic number 30. Also name the elements.
How will you account for the electronic configuration of the elements with atomic number of 24 and 29?
Or
Account for the following:
The continuous building up of 3d subshell interpreted in chromium (At. No. 24) and copper (At No. 29).
Or
Outer electronic configuration of chromium is 3d5 4s1 and not 3d4 4s2. Explain.
Short Answer TypeWrite the electronic configurations of the following ions: (a)H- (b) Na+ (c) O2- (d) F-
Which atoms are indicated by the following configurations?
(a) [He] 2s1
(b) [Ne] 3s2 3p3
(c) [Ar] 4s2 3d1.
Which of the following are isoelectronic species, i.e. those having the same number of electrons?
Na+, K+ , Mg2+, Ca2+, S2-, Ar.
What is the cause of greater stability of exactly half-filled and completely filled configurations?
An atom of an element contains 29 electrons and 35 Deutrons. Deduce (i) the number of protons and (ii) the electronic configuration of the element.
Long Answer TypeWrite the electronic configurations of the following ions/atom:
(i) Cu2+ (ii) Cr3+
(iii) Ni2+ (iv) Rubidium (Z = 37)
The electronic configuration of the given atom/ion is,
(i)Cu2+ :
Electronic configuration of Cu2+ (Z = 29) is 1s2 2s2 2p6 3s2 3p6 3d9
[∵ number of electrons = 29 - 2 = 27]
(ii) Cr3+:
Electronic configuration of Cr3+ (Z = 24) is 1s2 2s2 2p6 3s2 3p6 3d3
[∵ number of electrons = 24 - 3 = 21]
(iii) Ni2+:
Electronic configuration of Ni2+ (Z = 28) is 1s2 2s2 2p6 3s2 3p6 3d8
[∵ number of electrons = 28 - 2 = 26]
(iv) Rubidium (Z = 37):
Electronic configuration of Rb (Z = 37) is
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1
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