The correct set of four quantum numbers for the valence electron of rubidium atom (Z =37) is
1. 5, 1, 1, +1/2
2. 6, 0, 0, +1/2
3. 5, 0, 0, +1/2
4. 5, 1, 0, +1/2
The total number of atomic orbitals in fourth energy level of an atom is
1. 16
2. 32
3. 4
4. 8
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
Maximum number of electrons in a subshell of an atom can be determined by which of the following formula :
1. 4l + 2
2. 2l + 1
3. 4l - 2
4. 2n2
Which of the following is not permissible arrangement of electrons in an atom ?
1. n=4, l=0, m=0, s=-1/2
2. n=5, l=3, m=0, s=+1/2
3. n=3, l=2,m=-3, s=-1/2
4. n=3, l=2, m=-2, s=-1/2
If uncertainty in position and momentum are both equal, then uncertainty in velocity is:
1.
2.
3.
4.
The measurement of the electron position is associated with an uncertainty in momentum which is equal to 1x10-18 g cm s-1. The uncertainty in velocity of the electron will be:
(mass of an electron is 9 x 10-28 g)
1. 1 x 109 cm s-1
2. 1 x 106 cm s-1
3. 1 x 105 cm s-1
4. 1 x 1011 cm s-1