Which nuclear particle has no mass, no charge, but possesses spin?
a) Proton
b) Neutrino
c) Meson
d) Electron
Answer: b
Who received the Nobel Prize for discovering the neutron?
a) Chadwick
b) Rutherford
c) Neil Bohr
d) Roentgen
Answer: a
A doubly charged ion M²⁺ has an electronic configuration of 2, 8, 14 and atomic mass 56. What is the number of neutrons in its nucleus?
a) 30
b) 32
c) 34
d) 42
Answer: a
Which of the following groups are isotones?
a) ⁶C¹⁴, ⁷N¹⁵, ⁹F¹⁷
b) ⁶C¹², ⁷N¹⁴, ⁹F¹⁸
c) ⁶C¹⁴, ⁷N¹⁴, ⁹F¹⁷
d) ⁶C¹⁴, ⁷N¹⁴, ⁹F¹⁹
Answer: a
Identify the unrelated member in the group below:
a) Helium ion
b) Neutron
c) Proton
d) Cyclotron
Answer: d
The radius of an atomic nucleus is approximately:
a) 10⁻¹⁰ cm
b) 10⁻¹³ cm
c) 10⁻¹⁵ cm
d) 10⁻⁸ cm
Answer: b
Which two forces are responsible for the attraction between neutrons?
a) Gravitational and Electrostatic
b) Gravitational and Nuclear
c) Electrostatic and Nuclear
d) Some other forces
Answer: b
Which of the following is NOT electromagnetic in nature?
a) Cathode rays
b) X-rays
c) Gamma rays
d) Infrared rays
Answer: a
The electronic configuration of a calcium atom is:
a) [Ne] 4p²
b) [Ar] 4s²
c) [Ne] 4s²
d) [Kr] 4p²
Answer: b
According to Rutherford’s atomic model, electrons are:
a) Stationary
b) Centrally located
c) Non-stationary
d) None of these
Answer: c
Elements X and Y are isotones with atomic masses of 54 and 56 respectively. If X has atomic number 26, what is Y’s atomic number?
a) 26
b) 27
c) 28
d) 30
Answer: c
Which of the following elements has a higher atomic number than magnesium?
a) Neon
b) Fluorine
c) Sodium
d) Aluminium
Answer: d
Which element has an atomic number greater than that of aluminium?
a) Phosphorus
b) Neon
c) Magnesium
d) Sodium
Answer: a
Which of the following is a negatively charged ion (anion)?
a) Calcium ion
b) Zinc ion
c) Silver ion
d) Iodide ion
Answer: d
What is the atomic number of hydrogen?
a) 4
b) 3
c) 2
d) 1
Answer: d
Who discovered the atomic nucleus through experimental work?
a) Bohr
b) Rutherford
c) Moseley
d) Thomson
Answer: b
Who proposed the atomic theory of matter?
a) Avogadro
b) Dalton
c) Newton
d) Pascal
Answer: b
Which of the following elements has a higher atomic number than iron?
a) Manganese
b) Cobalt
c) Calcium
d) Chromium
Answer: b
Atomic number is represented by which letter?
a) A
b) N
c) Z
d) E
Answer: c
Anions are formed by:
a) Loss of electrons
b) Gain of electrons
c) Gain of protons
d) Loss of neutrons
Answer: b
Which property of an element is always a whole number?
a) Atomic mass
b) Atomic number
c) Atomic radius
d) Atomic volume
Answer: b
Mass number is the sum of:
a) Electrons and protons
b) Protons and neutrons
c) Electrons and neutrons
d) Only protons
Answer: b
Total number of orbitals in a principal shell is given by:
a) n
b) n²
c) 2n²
d) 3n²
Answer: b
Which element has an atomic number greater than phosphorus?
a) Aluminium
b) Silicon
c) Chlorine
d) Magnesium
Answer: c
Rutherford’s alpha-scattering experiment is related to the size of the:
a) Nucleus
b) Atom
c) Electron
d) Neutron
Answer: a