Homework Practice

Printable assignment

Atomic Models: From Plum Pudding to Nuclear Atom

Section A: Thomson and Rutherford Models

Question 1mcq

Thomson’s model compared the atom to:

A.A tissue model

B.Plum pudding

C.Solar system with fixed shells

D.A solid billiard ball only

Question 2mcq

A limitation of Thomson’s model was that it could not explain:

A.Rutherford scattering results

B.Cell division

C.Mixture separation

D.Existence of matter

Question 3mcq

Rutherford’s gold foil experiment showed that most of the atom is:

A.A living cell

B.Solid throughout

C.Made only of electrons

D.Empty space

Question 4mcq

Large deflection of a few alpha particles suggested:

A.Electrons are bigger than atoms

B.No nucleus exists

C.A small dense positively charged nucleus

D.Atoms are flat discs

Question 5mcq

Rutherford’s model could not fully explain:

A.That matter has mass

B.Stability of electrons revolving around nucleus

C.Presence of protons

D.That atoms exist

Question 6mcq

Atomic models changed over time because:

A.New experimental evidence required better explanations

B.Old models were always complete

C.Models never change

D.Scientists guessed randomly

Section B: Bohr Model and Stable Orbits

Question 7mcq

Bohr proposed that electrons revolve in:

A.Random paths with no energy levels

B.The nucleus only

C.Blood vessels

D.Fixed energy shells

Question 8mcq

In Bohr’s model, electrons do not radiate energy while:

A.Outside the atom completely

B.In a tissue

C.In permitted stable orbits

D.Inside protons

Question 9mcq

The first shell is called:

A.L shell

B.K shell

C.M shell

D.N shell

Question 10mcq

A labelled Bohr model should show:

A.Nucleus and electron shells

B.Only cell wall

C.Only leaf veins

D.Only organ systems

Question 11mcq

Which sequence of models is historically reasonable?

A.Bohr

\rightarrow

Thomson

\rightarrow

Rutherford

B.All came at same time

C.Rutherford

\rightarrow

Bohr

\rightarrow

Thomson

D.Thomson

\rightarrow

Rutherford

\rightarrow

Bohr

Question 12mcq

Why did Rutherford conclude the nucleus is tiny compared with atom?

A.All particles bounced back

B.Gold foil dissolved

C.Most alpha particles passed through without deflection

D.Electrons were visible directly