# Topic: Atomic Structure

1

Q:

Which of the following has maximum number of unpaired
electron (atomic number of Fe 26)

(a) :  Fe
(b) :  Fe (II)
(c) :  Fe (III)
(d) :  Fe (IV)

Explanation:

Q: (a) :  A
(b) :  B
(c) :  C
(d) :  D

Q:

The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number A is giv en by A cm 13 1 / 3 1.25 10   Radius of atom is one Å . If the mass number is 64, then the fraction of the atomic volume that is occupied by the nucleus is

(a) :  1.0 10 
(b) :   5 5.0 10 
(c) :  2 2.5 10 
(d) :   13 1.25 10

Q:

In a Bohr's model of atom when an electron jumps from n - 1 to n - 3 , how much energy will be emitted or absorbed

(a) :  2.15 ×10^-11 erg
(b) :   0.1911× 10^-10 erg
(c) :   2.389× 10^-12 erg
(d) :  0.239× 10^-10 erg

Q:

The electronic configuration of a dipositive metal  M2+ is 2, 8, 14 and its atomic weight is 56 a.m.u. The number of neutrons in its nuclei would be

(a) :  30
(b) :  32
(c) :  34
(d) :  42

Q: (a) :  A
(b) :  B
(c) :  C
(d) :  D

Q: (a) :  A
(b) :  B
(c) :  C
(d) :  D

Q:

The number of nodal planes in a x p is

(a) :  One
(b) :   Two
(c) :   Three
(d) :  Zero

Q:

The third line in Balmer series corresponds to an electronic transition between which Bohr ’s orbits in hydrogen

(a) :  5 -----> 3
(b) :   5 ----->2
(c) :   4 ----->3
(d) :   4 ------>2