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History of the Atom

Total questions: 28

Worksheet time: 3hrs 23mins

Name
Class
Date
1.
Who discovered that the nucleus contains positively charged particles called protons?
a)
Ernest Rutherford
b)
James Chadwick
c)
Democritus
d)
Niels Bohr
2.
Who discovered the electron?
a)
Niels Bohr
b)
Democritus
c)
Joseph Thomson
d)
John Dalton
3.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
4.
The central region of an atom where neutrons and protons are located is the __________________.
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
5.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
6.
Matter always has mass.
a)
true
b)
false
7.

Worked with Rutherford to discover particles with no charge -- called neutrons.

a)

James Chadwick

b)

Niels Bohr

c)

Democritus

d)

Thomson

8.

Used the word "atomos" to decsribe the uncuttable (indivisible) atom.

a)

Democritus

b)

Thomson

c)

Bohr

d)

Dalton

9.

Proposed that electrons move around the nucleus in specific layers, or shells.

a)

Bohr

b)

Rutherford

c)

Chadwick

d)

Thomson

10.

This picture best represents ___________________ atomic model.

a)

Thomson's

b)

Dalton's

c)

Bohr's

d)

Chadwick's

11.

Which one of the following discoveries came first?

a)

electrons

b)

neutrons

c)

quarks

d)

atoms

12.

Rutherford and his students did experiments that showed

a)

quark

b)

nucleus

c)

proton

d)

electron

13.

Bohr discovered that electrons are located in

a)

the nucleus

b)

inside protons

c)

electron cloud

d)

circular orbits around the nucleus

14.

Which scientist discovered that the nucleus contained neutrons?

a)

bohr

b)

Rutherford

c)

Dalton

d)

Chadwick

15.

What is a particle with one negative charge called?

a)

electron

b)

proton

c)

quark

d)

neutron

16.

The smallest particle of an element that still represents that element.

a)

Nucleus

b)

electron

c)

proton

d)

atom

17.

What is a particle with one positive charge called?

a)

proton

b)

electron

c)

neutron

d)

quark

18.

What is the neutral particle found in the nucleus called?

a)

proton

b)

neutron

c)

electron

d)

quark

19.

What is the center of an atom called?

a)

nucleus

b)

electron cloud

c)

proton center

d)

photon center

20.

Which one of the following parts of the atom is the smallest?

a)

atom

b)

neutron

c)

quark

21.

Which one of the following parts of the atom is the smallest?

a)

neutron

b)

nucleus

c)

atom

22.

Which one of the following is the correct order of scientific contribution of the atom?

a)

Chadwick, Dalton, Bohr, Rutherford, Democritus,Thomson

b)

Thomson, Democritus,Rutherford, Bohr, Dalton ,Chadwick

c)

Dalton, Chadwick ,Bohr, Rutherford, Democritus,Thomson

d)

Democritus, Dalton, Thomson, Rutherford, Bohr, Chadwick

23.

Bohr discovered that electrons are located in

a)

the nucleus

b)

inside protons

c)

electron cloud

d)

circular orbits around the nucleus

24.

Used alpha particles to discover the nucleus

a)

Thomsan

b)

Becquerel

c)

Millikan

d)

Rutherford

25.
This model of the atom described atoms as tiny spheres that could not be broken down into smaller pieces.
a)
Dalton's model of the atom
b)
The "Plum Pudding Model" of the atom
c)
The Nuclear Model
d)
The Bohr Model
26.
What Greek philosopher first spoke about the idea of an atom?
a)
Democritus
b)
Dalton
c)
Thompson
d)
Rutherford
27.
Who performed the Gold Foil Experiment?
a)
J. J. Thomson
b)
Ernest Rutherford
c)
Neils Bohr
d)
John Dalton
28.
According to the Bohr Model, electrons are only found in specific orbits around the nucleus called __________________________
a)
Energy Levels
b)
Electron Lanes
c)
Electron Places
d)
Atomic Mass

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