Atomic Structure: MCQ Test (25 questions)

Question 1 of 25

Who discovered the electron in the year 1897?

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

Question 2 of 25

When Rutherford bombarded a thin sheet of metal with alpha (α) particles to discover the nucleus, then-

AMost of the alpha particles passed through the metal foil without any emission.
BAll the alpha particles passed through the metal foil.
CMost of the alpha particles are deflected by small angles
DMost of the alpha particles are reflected back.

Question 3 of 25

The nucleus of an atom contains the following particles:

Aprotons and neutrons
BElectrons and α-particles
Cprotons and electrons
Delectrons and neutrons

Question 4 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 5 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 6 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 7 of 25

The positive charge of the nucleus was discovered by-

AThomson
BRutherford
CBohr
DJames Chadwick

Question 8 of 25

The nature of elements can be known by-

Aby electronic configuration
Bby atomic number
Cby atomic mass
DBy atomic weight

Question 9 of 25

The number of core electrons in sodium atom is-

A1
B2
C8
D10

Question 10 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 11 of 25

The particle that binds the nucleon is-

Aelectron
BPositron
CNeutron
DMason

Question 12 of 25

The maximum number of electrons that an atom of an element can have in its second orbit is-

A8
B32
C18
D2

Question 13 of 25

"The position and velocity of small particles like electrons cannot be determined simultaneously" is the statement of-

AHeisenberg's uncertainty principle
BPauli's exclusion principle
Cof the Aufbau principle
DDe Broglie's idea of the wave nature of electrons

Question 14 of 25

An atom has a mass number of 23 and an atomic number of 11. Find the number of protons.

A23
B22
C12
D11

Question 15 of 25

Which one of the following most accurately determines the atomic number of an element?

Anumber of protons
Bnumber of protons and electrons
Cnumber of nucleons
DNumber of ions

Question 16 of 25

Rutherford's alpha particle scattering experiment on thin gold foil is responsible for the discovery of which of the following?

Aelectron
BProton
Catomic nucleus
DNeutron

Question 17 of 25

If an atom of an element has 2 protons, 2 neutrons and 2 electrons, then what will be the mass number of that element?

A2
B4
C6
D8

Question 18 of 25

Which one of the following is the correct electronic configuration of chlorine?

A2, 7, 8
B2, 8, 7
C2, 8, 8
D7, 8, 2

Question 19 of 25

The scattering of which rays can be used to estimate the size of the nucleus?

Aα-particles
Bβ-particles
Cγ-particles
DX-particle

Question 20 of 25

The international standard of atomic weight is-

AO-16
BN-14
CC-12
DH-1

Question 21 of 25

Who discovered the atomic nucleus?

ARutherford
BDoulton
CEinstein
DThomson

Question 22 of 25

Atoms are electrically-

Apositively
Bnegatively
Cbipositively
Dindifferently

Question 23 of 25

In which of the following particles is the double nature of narrow-wave found?

AMason
BProton
Celectron
DNeutron

Question 24 of 25

The correct relation between energy (E), momentum (p) and velocity (c) of a photon is-

Ap=Ec²
Bp=Ec
Cp=c/E
Dp=E/c

Question 25 of 25

Which of the following is the most fundamental characteristic of an element?

Amelting point
Batomic number
CColour
Datomic mass