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History of the Atom

Total questions: 44

Worksheet time: 58mins

Name
Class
Date
1.

Who developed the planetary model of the atom?

a)

Niels Bohr

b)

Ernest Rutherford

c)

John Dalton

d)

Democritus

2.

Democritus was known for

a)

discovering the electron

b)

discovering the proton

c)

creating the term atom, meaning indivisible

d)

discovering the nucleus

3.

John Dalton said that all atoms of the same element are identical.

a)

True

b)

False

4.

JJ Thomson discovered the

a)

nucleus

b)

proton

c)

neutron

d)

electron

5.

Who created the plum pudding model?

a)

JJ Thomson

b)

Ernest Rutherford

c)

Niels Bohr

d)

John Dalton

6.

What did Ernest Rutherford fire at the gold foil?

a)

radioactive particles

b)

particles

c)

subatomic particles

d)

alpha particles

7.

What did Rutherford EXPECT to happen in the gold foil experiment?

a)

all alpha particles pass through the gold foil

b)

All alpha particles deflected by gold foil

8.

What did Ernest Rutherford discover about the atom?

a)

The charge of the electron

b)

That the atom is a sphere

c)

The electron

d)

The proton

9.

What did Niels Bohr discover about electrons?

a)

Electrons orbit the nucleus

b)

Protons circle the nucleus

c)

The nucleus circle the atom

d)

Electrons don't exist

10.

Bohr's model of the atom was called

a)

Plum Pudding

b)

Billiard Ball

c)

Nuclear Model

d)

Planetary Model

11.

What did Erwin Schrodinger do to help with atomic theory?

a)

He developed the Electron Cloud Model.

b)

Made the Bohr Model.

c)

Discovered the Protons.

d)

None of the Above.

12.

James Chadwick discovered the

a)

electron

b)

proton

c)

neutron

d)

alpha particle

13.

What two parts are in the nucleus of the atom?

a)

proton and electron

b)

proton and neutron

c)

neutron and electron

14.

Which part of the atom has the smallest mass?

a)

electron

b)

proton

c)

neutron

d)

nucleus

15.

The neutron has no charge (it's neutral).

a)

True

b)

False

16.

The proton has a _____________ charge.

a)

negative

b)

positive

c)

neutral

17.

The _____________ has a negative charge.

a)

proton

b)

neutron

c)

nucleus

d)

electron

18.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
19.
Which experiment taught us that atoms are mostly empty space and have a positively charged nucleus?
a)
Plum Pudding Model
b)
Cathode Ray Tube
c)
Gold Foil Experiment
d)
Planetary Model
20.
If an atom has extra neutrons, it is called a?
a)
Isotope
b)
Ion
c)
Cation
d)
Anion
21.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
a)
74.92 amu
b)
24.97 amu
c)
75.01 amu
d)
74.51 amu
22.

The average atomic mass of an element is the ___.

a)

average of the mass number and the atomic number for the element

b)

weighted average of the masses of the isotopes of the element

c)

total mass of the isotopes of the element

d)

a traditional average of the masses of the isotopes of the element

23.
An isotope has three forms.  30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu.  Average atomic mass will be closest to
a)
2 amu
b)
3 amu
c)
4 amu
d)
5 amu
24.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
25.
The nucleus is ____________ charged whereas the electron cloud is ____________ charged. 
a)
negatively, positively
b)
negatively, negatively
c)
positively, positively
d)
positively, negatively
26.
The  mass of an atom is located  in the ___________ and the volume of an atom is made of the ____________
a)
electron cloud, nucleus
b)
electron cloud, energy levels
c)
nucleus, electron cloud
d)
nucleus, neutrons
27.

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

a)

Democritus

b)

Thomson

c)

Bohr

d)

Dalton

28.

What is the correct order of scientists in order of their work related to the atomic theory from earliest to most recent?

a)

Neils Bohr, Ernest Rutherford, JJ Thomson, John Dalton, & Democritus

b)

JJ Thomson, John Dalton, Neils Bohr, Ernest Rutherford, & Democritus

c)

Democritus, John Dalton, JJ Thomson, Ernest Rutherford, and Neils Bohr

d)

John Dalton, Neils Bohr, JJ Thomson, Democritus, & Ernest Rutherford

29.

Who proposed that electrons don’t move around the nucleus in orbits, but in specific energy levels as a cloud?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

e)

Schrödinger

30.

Which French chemist proposed the law of conservation of mass

a)

Antoine Lavoisier

b)

Jean Luke Picard

c)

Jacques Gusto

d)

Alexandre Dumas

31.

Which scientist discovered that cathode rays were deflected by a negative plate and thus made up of negatively charged particles?

a)

Antoine Lavoisier

b)

James Dalton

c)

Eugen Goldstein

d)

J.J. Thompson

32.

How many neutrons does Barium-138 have?

a)

138

b)

56

c)

137.33

d)

82

33.

What does the top number represent?

a)

Atomic number

b)

Atomic Mass

c)

Mass number

d)

Electrons

34.

What is one twelfth the mass of a carbon-12 atom?

a)

Atomic number

b)

Atomic mass

c)

Mass number

d)

Atomic mass unit (amu)

35.
Ions are: 
a)
atoms with a positive or negative charge
b)
atoms with no charge
c)
atoms with ONLY a positive charge
d)
atoms with ONLY a negative charge
36.
How many electrons are in an atom that has an atomic number of 34, an atomic mass of 74 and a charge of -2?
a)
34
b)
36
c)
2
d)
40
37.
4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?
a)
41.97 amu
b)
42.19 amu
c)
10.43 amu
d)
40.04 amu
38.
What is the name of the atom pictured here?
a)
Nitrogen
b)
Nitrogen-15
c)
Nitrogen-7
d)
Nitrogen-8
39.
How many grams is 1.2 moles of Neon?
a)
0.05 grams
b)
16.6 grams
c)
21.2 grams
d)
24 grams
40.
How many moles of magnesium are in 3.01x1022 atoms of magnesium?
a)
5.00x1044 moles Mg
b)
0.050 moles Mg
c)
1.81x1046 moles Mg
d)
5 moles Mg
41.
How many grams of carbon are in 0.63 moles of carbon?
a)
3.79x1023 g C
b)
.0524 g C
c)
7.57 g C
d)
.800 g C
42.
You have 8.65 x 1025 atoms of arsenic. How many grams do you have?
a)
144 g As
b)
10,765 g As
c)
107 g As
d)
None of these
43.
Calculate the number of atoms in 4.00 x 10-5 g of sodium.
a)
1.05 x 1018 atoms
b)
3.92 x 1019 atoms
c)
3.24 x 1023 atoms
d)
5.54 x 1020 atoms
44.

Calculate the number of moles in 20.9 grams of nitrogen.

a)
1.49 moles
b)
0.746 moles
c)
0.37 moles
d)
1.74 moles

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