How many unpaired electrons are present in Ni2+ cation (atomic number = 28)
1. 0
2. 2
3. 4
4. 6
The correct order of increasing energy of atomic orbital is:
1. 3s, 3p, 4s, 3d, 4p
2. 3s, 3p, 3d, 4s, 4p
3. 3s, 3p, 4s, 4p, 3d
4. 3s, 3p, 3d, 4p, 4s
Elements upto atomic number 103 have been synthesized and studied. If a newly discovered element is found to have an atomic number 106, its electronic configuration will be -
1. [Rn] 5f14, 6d4, 7s2
2. [Rn] 5f14, 6d1, 7s2 7p3
3. [Rn] 5f14, 6d, 7s0
4. [Rn] 5f14, 6d5, 7s1
The group number and electronic configuration of element Z =114 is:
1. Halogen family, [Rn]5f146d107s27p5
2. Carbon family, [Rn]5f146d107s27p2
3. Oxygen family, [Rn]5f146d107s27p4
4. Nitrogen family, [Rn]5f146d107s27p6
The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64) and Tb (Tb Atomic no. 65) are
1. [Xe]4f65d16s2, [Xe]4f75d16s2 and [Xe]4f96s2
2. [Xe]4f65d16s2, [Xe]4f75d16s2 and [Xe]4f85d16s2
3. [Xe]4f76s2, [Xe]4f75d16s2 and [Xe]4f96s2
4. [Xe]4f76s2, [Xe]4f86s2 and [Xe]4f85d16s2
The magnetic moment of 2.84 BM can be shown by:
(At. no. Ni = 28, Ti = 22, Cr = 24, Co = 27)
1. Ni2+
2. Ti3+
3. Cr3+
4. Co2+
Which is the correct order of increasing energy of the listed orbitals in the atom of
titanium?
1. 3s 4s 3p 3d
2. 4s 3s 3p 3d
3. 3s 3p 3d 4s
4. 3s 3p 4s 3d
If the principal quantum number n=6, the correct sequence of filling of electrons will be:
(1) ns→np→(n-1)d→(n-2)f
(2) ns→(n-2)f→(n-1)d→np
(3) ns→(n-1)d→(n-2)f→np
(4) ns→(n-2)f→np→(n-1)d
Which one of the following ions has electronic configuration [Ar]3d6?
(At. no: Mn = 25, Fe = 26, Co = 27, Ni =28)
1. Ni3+
2. Mn3+
3. Fe3+
4. Co3+
Which one of the elements with the following outer orbital configurations may exhibit the
largest number of oxidation states ?
1. 3d3, 4s2
2. 3d5, 4s1
3. 3d5, 4s2
4. 3d2, 4s2