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ATOMIC THEORY

Total questions: 23

Worksheet time: 4hrs 50mins

Name
Class
Date
1.
Which of the following best describes the Bohr model atom?
a)
It shows that electrons are evenly scattered in the atom
b)
Electrons are in the nucleus of an atom
c)
Electrons are in orbits around the nucleus
d)
It showed that electrons can be found anywhere in the atom
2.
Which subatomic particle was discovered by Thomson?
a)
Electrons
b)
Protons
c)
Neutrons
d)
Quarks
3.
The following diagram shows which model of the atom?
a)
Dalton's Model
b)
The Plum Pudding Model
c)
Bohr's Model
d)
Schrodinger's Model
4.
What scientist is best known for his "Plum Pudding" model of the atom?
a)
J.J. Thomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
5.
What contribution did John Dalton make to atomic theory? 
a)
He discovered that every atom was positively charged. 
b)
He discovered that every element consisted of one type of atom that couldn't be divided. 
c)
He discovered that atoms had nuclei. 
d)
He discovered that atoms could be divided into smaller parts. 
6.
The first person to propose a theory about an atom called the Atomos Theory was
a)
Democritus
b)
Rutherford
c)
Dalton
d)
Aristotle
7.
Who discovered the proton?
a)
Thomson
b)
Dalton
c)
Bohr
d)
Rutherford
8.

Who proposed this model of atoms?

a)

Dalton

b)

Bohr

c)

Rutherford

d)

Thomson

9.

Where are the electrons located?

a)

nucleus

b)

there are no electrons

c)

orbitals/energy levels/cloud

d)

in the middle of the atom

10.

Select ALL the subatomic particles that are located in the nucleus

a)

proton

b)

neutron

c)

electron

d)

bootron

11.

Atom is mostly empty space

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

12.

Discovered the nucleus of the atom

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

13.

Said elements are composed of atoms and different elements have different types of atoms. Elements can combine together to form new things.

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

14.

Current model of the atom, with electrons in clouds

a)

Modern scientists

b)

Dalton

c)

Thomson

d)

Rutherford

15.

Model of the atom where electrons orbit the nucleus in energy levels

a)

Thomson

b)

Rutherford

c)

Bohr

d)

Dalton

16.

Charge of protons?

a)

positive

b)

negative

c)

neutral

d)

no charge

17.
An atom is electrically neutral when
a)
protons and neutrons are the same
b)
protons and electrons are the same
c)
neutrons and electrons are the same
d)
neutrons balance the protons and electrons
18.

What is the smallest particle of an element that retains the chemical properties of that element?

a)

ion

b)

isotope

c)

atom

d)

element

19.
What was James Chadwicks most notable discovery?
a)
The nucleus contains protons. 
b)
The nucleus contains neutrons.
c)
Electron are not fixed.
d)
Protons are positive.
20.
True or False? John Dalton believed that moving electrons exist in electron clouds around the nucleus. 
a)
False
b)
True 
21.

Thomson Experimented with ______

a)

Gold Foil

b)

alpha particles

c)

cathode rays

d)

protons

22.

Rutherford experimented with ____

a)

Gold foil and alpha particles

b)

Cathode rays and alpha particles

c)

electron and alpha particles

d)

gold foil and cathode rays

23.

Which of the following shows the correct order of Atomic Theory Timeline

a)

Rutherford, Bohr, Dalton, Democritus, Thomson

b)

Bohr, Democritus, Thomson, Rutherford, Dalton

c)

Dalton, Thomson, Rutherford, Bohr, Democritus

d)

Democritus, Dalton, Thomson, Rutherford, Bohr

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