Atomic Structure: MCQ Test (25 questions)

Question 1 of 25

Who developed the model of atomic structure?

AAlfred Nobel
BFaraday
CBohr and Rutherford
DVolta

Question 2 of 25

When an electron moves from a higher orbit to a lower orbit, then-

Aenergy is released
BEnergy is absorbed.
Cthe size of the atom decreases
Dnone of these

Question 3 of 25

The discoverer of 'meson' is-

APaulie
BChadwick
CYukawa
DThomson

Question 4 of 25

What is the number of protons in a negatively charged atom (anion)?

Agreater than the atomic number of the element
Bless than the atomic number of the element
Cmore than the number of electrons in the atom
Dless than the number of electrons in the atom

Question 5 of 25

The uncertainty principle was formulated by-

AEinstein
BHeisenberg
CRutherford
DPaulie

Question 6 of 25

Who among the following proposed that the atom is indivisible?

ADalton
BBerzelius
CRutherford
Davogado

Question 7 of 25

Who discovered the electron in the year 1897?

AJ. J. Thomson
BT. A. Edison
CNikolas Tesla
DIsaac Newton

Question 8 of 25

If the third orbit of an atom is the outermost orbit, what is the maximum number of electrons it can hold?

A8
B16
C18
D36

Question 9 of 25

Rutherford's scattering experiment proved the existence of what?

Aatoms in all matter
Belectrons in atoms
CNucleus in atoms
DNeutrons in atoms

Question 10 of 25

The positive charge of the nucleus was discovered by-

AThomson
BRutherford
CBohr
DJames Chadwick

Question 11 of 25

The quantum number that specifies the direction of orientation in space of an orbit is-

Aprincipal quantum number
Borbital quantum number
Cmagnetic quantum number
Dspin quantum number

Question 12 of 25

The atomic number of an element is 35 and it has 18 electrons, then the number of protons in it will be-

A17
B18
C20
D15

Question 13 of 25

Which of the following electronic configurations is for metallic elements?

A2, 8
B2, 8, 7
C2, 8, 8
D2, 8, 8, 2

Question 14 of 25

The number of electrons and neutrons in an element is 18 and 20 respectively. The mass number of this element is-

A22
B2
C38
D20

Question 15 of 25

Which one of the following statements regarding the atomic weight of an element is most appropriate?

AThe atomic mass of an element is the sum of the protons and neutrons present in the atom of that element.
BThe atomic weight of an element can vary depending on its mass number.
CThe atomic weight of an element is an integer
DAll atoms of an element have the same atomic weight

Question 16 of 25

Which of the following is a 'temporary' particle?

Aelectron
BProton
CNeutron
DAll of these

Question 17 of 25

Which of the following electronic configurations occurs for metallic elements?

A2,8
B2, 8, 7
C2, 8, 18
D2, 8, 18, 2

Question 18 of 25

An atom of an element has 19 protons and 20 neutrons. Its mass number will be-

A39
B19
C20
D12

Question 19 of 25

1s², 2s²2p⁶ is the electronic configuration of?

ANa and Ne
BNe and Na⁺
CNe and F
DNa⁺ and F

Question 20 of 25

The atomic mass of an element is equal to the sum of the numbers of which of the following?

Aonly the number of electrons and protons
Bonly the number of protons and neutrons
Conly the number of electrons and neutrons
DThe number of electrons, protons, and neutrons

Question 21 of 25

What are the three basic components of an atom?

Aprotons, neutrinos and ions
Bprotons, neutrons and electrons
Cprotium, deuterium and tritium
Dproton, neutron and ion

Question 22 of 25

Who discovered the 'proton'?

AGoldstein
BChadwick
CThomson
DFaraday

Question 23 of 25

The number of neutrons in ₉₂U²ᶾ⁸ will be-

A146
B234
C90
D148

Question 24 of 25

Which of the following statements regarding the properties of neutrons is not correct?

AThe mass of a neutron is approximately equal to the mass of a proton.
BThe charge of a neutron is zero
CNeutron is located inside the atomic nucleus
DNeutrons revolve around the atomic nucleus

Question 25 of 25

Which of the following conclusions could not be drawn from Rutherford's α-particle scattering experiment?

AMost of the space in an atom is empty
BThe radius of the atom is approximately 10⁵ times the radius of the nucleus.
CElectrons move in circular paths of constant energy, called orbits
DAlmost all the mass of an atom is in the nucleus