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The atom history

Total questions: 25

Worksheet time: 13mins

Name
Class
Date
1.

Who discovered the atom's electrons?

a)

Robert Millikan

b)

JJ Thomson

c)

Ernst Rutherford

d)

Niels Bohr

2.
Who was the first person to come up with the Atomic Theory?
a)
John Dalton
b)
Democritus
c)
Ernest Rutherford
d)
Niels Bohr
3.
What is Niels Bohr responsible for discovering?
a)
That electrons are inside the nucleus
b)
That electrons are in fixed orbits around the nucleus
c)
That electrons are small
d)
That electrons are negative
4.
What scientist is best known for his "Plum Pudding" model of the atom?
a)
J.J. Tomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
5.
Which model involved gold foil?
a)
Thomson Model
b)
Rutherford Model
c)
Cloud Model
d)
Bohr Model
6.
The nucleus is made up of protons and what other particle?
a)
Electrons
b)
Nothing else
c)
Neutrons
d)
Atomic Number
7.
What did James Chadwick discover?
a)
neutrons
b)
electrons
c)
the atomic theory
d)
protons
8.
an atom with atomic number 6 would have how many protons 
a)
6
b)
12
c)
3
d)
cannot be determined 
9.
Which statement best describes an electron?
a)
Smaller mass than a proton and a negative charge
b)
Smaller mass than a proton and a positive charge
c)
Greater mass than a proton and a negative charge
d)
Greater mass than a proton and a positive charge
10.
Who coined the term "atomos"?
a)
Aristotle
b)
Socrates
c)
Democritus
d)
Dalton
11.
Which scientist proposed that all matter is composed of atoms, which he assumed were indivisible and indestructible building blocks of nature.
a)
J. J. Thompson
b)
John Dalton
c)
Neils Bohr
d)
Ernest Rutherford
12.
Which experiment was performed by J. J. Thompson in 1897?
a)
Oil Drop Experiment
b)
Gold Foil Experiment
c)
Wave  Experiment
d)
Cathode Ray Experiment
13.
Who performed the Gold Foil Experiment?
a)
J. J. Thomson
b)
Ernest Rutherford
c)
Neils Bohr
d)
John Dalton
14.
Which subatomic particle was discovered by James Chadwick?
a)
proton
b)
neutron
c)
electron
d)
quark
15.

Why was the neutron the last particle to be discovered in an atom?

a)

They are so much smaller in mass and size than a proton that they are hard to detect.

b)

Scientists were overlooking their large mass.

c)

They are neutral and therefore difficult to detect.

d)

The neutron was not the last particle to be discovered. The electron was.

16.
Which number here is my atomic number?
a)
5
b)
10.811
17.
How many protons does this atom have?
a)
2.5
b)
6
c)
5
d)
10.811
18.
How many Electrons
a)
2.5
b)
5
c)
6
d)
10.81
19.
In order for me to find the number of neutrons, I must round the atomic mass and then do what?
a)
atomic number-atomic mass
b)
atomic number x atomic mass
c)
atomic mass + atomic number
d)
atomic mass - atomic number
20.

How many neutrons does this atom have?

a)

2.5

b)

5

c)

6

d)

10.81

21.

An atom with the same number of protons but different numbers of neutrons is know as an

a)

ion

b)

quarks

c)

lepton

d)

isotope

22.

All atoms have isotopes.

a)

True

b)

False

23.

Today's modern atomic theory is known as the...

a)

Electron cloud theory

b)

Electron fan theory

c)

Fan blade theory

d)

Fan cloud theory

24.

Today's atomic theory states that electrons are usually found in certain areas around the nucleus, but they may be found at other places besides these common areas. This model is referred to as the

a)

Electron Cloud theory

b)

Moving Fan theory

c)

Niles Bohr Fan theory

d)

The Profound Electron Motion theory

25.

The 3 subatomic particles of an atom are the Proton, electron and (a)  

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