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Phy Sci, Ch 4, Structure of Atom, Post Assessment

Total questions: 25

Worksheet time: 23mins

Name
Class
Date
1.
The first person to ever talk about an atom was
a)
Democritus
b)
Rutherford
c)
Dalton
d)
Aristotle
2.
How did Rutherford discover the proton?
a)
Cathode tube ray experiment
b)
Gold Foil Experiment
c)
Planetary Model
d)
Plum Pudding Model
3.

What scientist is best known for his "Plum Pudding" (or "chocolate chip cookie") model of the atom?

a)

J.J. Tomson

b)

Ernest Rutherford

c)

John Dalton

d)

Democritus

4.

What contribution did John Dalton make to atomic theory?

a)

He discovered that every atom was positively charged.

b)

He discovered that atoms were real.

c)

He discovered that atoms had nuclei.

d)

He discovered that atoms could be divided into smaller parts.

5.
J.J. Thomson provided evidence that an atom...
a)
is the smallest particle of matter
b)
contains negatively charged particles
c)
has an overall negative charge
d)
has an overall positive charge
6.
Rutherford's gold foil experiment provided evidence that...
a)
negative and positive charges are spread evenly throughout the atom.
b)
alpha particles have a positive charge.
c)
gold is not a dense as previously thought.
d)
there is a dense positively charged nucleus at the center of an atom.
7.
An atom's overall charge is ________.
a)
positive 
b)
depends
c)
neutral 
d)
negative 
8.
True or False: The majority of an atom is made up of empty space
a)
True
b)
False
9.
The majority of an atom's mass exists where?
a)
In the nucleus
b)
In the electron cloud
c)
In the space between the nucleus and the electrons
d)
In the neutrons
10.
Which particle has a positive charge?
a)
electron
b)
orbital
c)
proton
d)
neutron
11.
Choose the particle that has no charge.
a)
nucleus
b)
neutron
c)
proton
d)
electron
12.
This particle determines what element you have - the elements identity.
a)
electron
b)
proton
c)
neutron
d)
valence shell
13.
An electron has a _____ charge.
a)
negative
b)
positive
c)
neutral
14.
The particles of the atom you can find by knowing the atomic number.
a)
neutrons
b)
protons and electrons
c)
protons and neutrons
d)
atomic mass
15.

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

a)

20

b)

10

c)

35

d)

25

16.

How many neutrons are in C-14?


Hint: The Atomic Number (# of Protons) is 8 and C-12 has 6 neutrons

a)

6

b)

7

c)

14

d)

8

17.

How many neutrons does the isotope of lithium have?


Hint: The Atomic Number is 3.

a)

8

b)

3

c)

4

d)

5

18.
What quantities vary between isotopes of an element?
a)
protons, electrons, and atomic mass
b)
protons, electrons, and atomic number
c)
neutrons and electrons
d)
neutrons and atomic mass
19.

Atom 1- Protons=17 Neutrons=19

Atom 2- Atomic #= 18 Mass= 40 Electrons=18


Are these atoms isotopes of each other or different elements?

a)

Different Elements - Cl & Ar

b)

Different Elements - K & Ti

c)

Isotopes of Argon

d)

Isotopes of Potassium

20.

An element has three different isotopes.


One has a mass of 35.00 amu; another has a mass of 36.00 amu; and another has a mass of 38.00 amu.


What is the average atomic mass of this element?


Hint: How do you find an average?

a)

36.33 amu

b)

37.00 amu

c)

12.11 amu

d)

impossible to tell

21.
True or False - Protons and Neutrons have about the same mass.
a)
True - They have about the same mass
b)
False - They do not have about the same mass
22.
Which two subatomic particles make up the nucleus of an atom?
a)
Protons and Electrons
b)
Neutrons and Electrons
c)
Electrons and Protons
d)
Protons and Neutrons
23.
The mass of one proton is equal to the mass of one...
a)
neutron
b)
electron
24.
The mass of one proton is greater than the mass of one...
a)
neutron
b)
electron
25.
The mass of about 1,836 electrons is equal to the mass of one...
a)
proton
b)
neutron
c)
a proton or a neutron
d)
neither a proton nor a neutron

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