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.A solid billiard ball only

C.Plum pudding

D.Solar system with fixed shells

Question 2mcq

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

A.Mixture separation

B.Rutherford scattering results

C.Existence of matter

D.Cell division

Question 3mcq

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

A.Solid throughout

B.Empty space

C.A living cell

D.Made only of electrons

Question 4mcq

Large deflection of a few alpha particles suggested:

A.A small dense positively charged nucleus

B.Electrons are bigger than atoms

C.Atoms are flat discs

D.No nucleus exists

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.Old models were always complete

B.New experimental evidence required better explanations

C.Models never change

D.Scientists guessed randomly

Section B: Bohr Model and Stable Orbits

Question 7mcq

Bohr proposed that electrons revolve in:

A.Blood vessels

B.The nucleus only

C.Fixed energy shells

D.Random paths with no energy levels

Question 8mcq

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

A.In permitted stable orbits

B.In a tissue

C.Outside the atom completely

D.Inside protons

Question 9mcq

The first shell is called:

A.N shell

B.M shell

C.L shell

D.K shell

Question 10mcq

A labelled Bohr model should show:

A.Only organ systems

B.Nucleus and electron shells

C.Only leaf veins

D.Only cell wall

Question 11mcq

Which sequence of models is historically reasonable?

A.All came at same time

B.Rutherford

\rightarrow

Bohr

\rightarrow

Thomson

C.Bohr

\rightarrow

Thomson

\rightarrow

Rutherford

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.Electrons were visible directly

D.Most alpha particles passed through without deflection