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Atomic Physics

Total questions: 25

Worksheet time: 19mins

Name
Class
Date
1.

What makes something radioactive?

a)

an unstable nucleus

b)

contaminated sewage

c)

elements with an atomic number above 81

d)

it decays over time

2.

What is radioactive decay?

a)

The spontaneous breakdown of an atomic nucleus resulting in only energy release

b)

The spontaneous breakdown of an atomic nucleus resulting in only matter release

c)

The spontaneous breakdown of an atomic nucleus resulting in a release of energy and matter

d)

The decay of the use of radios and the increased use of televisions

3.

One disadvantage of nuclear energy is _______.

a)

it is a fossil fuel

b)

it emits large amounts of pollution into the atmosphere

c)

it leaves behind radioactive waste

d)

there are not disadvantages

4.

When does radioactive decay occur?

a)

When the nucleus of an isotope is unstable

b)

When the electrons of an isotope are spinning

c)

When the nucleus of an isotope is stable

d)

When the electrons of an isotope are shared with another isotope

5.

A particle with a positive charge that determines the element

a)

proton

b)

nucleus

c)

neutron

d)

electron

6.

This equation shows how mass and the speed of light convert to energy

a)

E=mc

b)

E=mc2

c)

E=mc3

d)

E=m

7.

In E=mc2 what does 'c' stand for?

a)

core

b)

carbon

c)

speed of light

d)

energy

8.

______________ is a process by which unstable atoms emit radiation until they become stable.

a)

Radiation

b)

Chemical Reaction

c)

Radioactive Decay

d)

Isotopes

9.

What is the smallest unit of matter? It is composed of protons and neutrons, held together in the nucleus, and electrons around the nucleus in different electron orbitals, which form an electron cloud.

a)

cell

b)

nucleus

c)

atom

d)

electron

10.

What is the center of an atom containing protons and neutrons?

a)

nucleus

b)

neutron

c)

proton

d)

electron cloud

11.

How many neutrons does a Hydrogen atom have?

a)

1

b)

2

c)

3

d)

0

12.
In order for an atom to be neutral what has to be true?
a)
The atom has more protons than neutrons
b)
The atom has more neutrons than protons
c)
The atom has the same number of protons and neutrons
d)
The atom has the same number of protons and electrons
13.
This model this model was the first to show a nucleus, consisting of protons and neutron.  Electrons surround the nucleus but are not shown in distinct energy levels. 
a)
The "Rutherford Model" of the atom
b)
The "Plum Pudding Model" of the atom
c)
The "Quantum Mechanical Modell" of the atom
d)
Democritus's model of the atom
14.
This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces.
a)
Democritus's model of the atom
b)
The "Plum Pudding Model" of the atom
c)
The "Rutherford Model" of the atom
d)
The "Quantum Mechanical Model" of the atom
15.
This model added on to previous models by showing electrons existed at certain "energy levels". However it does not accurately show what those levels look like.
a)
The "Bohr Model" of the atom
b)
The "Rutherford Model" of the atom
c)
The "Plumb Pudding Model" of the atom
d)
The "Quantum Mechanical Model" of the atom
16.
This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. Is shows electrons floating freely in a positive space.
a)
The "Plum Pudding Model" of the atom
b)
The "Rutherford Model" of the atom
c)
Democritus's model of the atom
d)
The "Quantum Mechanical Model" of the atom
17.
Ernest Rutherford discovered that atoms were mostly _________________. 
a)
negatively charged
b)
positively charged
c)
electrons
d)
empty space. 
18.
In the gold foil experiment, most of the positively charged alpha particles passed through the gold foil, but some were deflected or bounced back.  What did we conclude because of this?  
a)
Atoms are small indivisible spheres
b)
Atoms are mostly empty space with a small, dense, positive center
c)
Atoms have negatively charged particles which orbit the nucleus
d)
Light is a wave, not a particle
19.
Discovered the electron using cathode ray tube
a)
Joseph Thomson
b)
John Dalton
c)
Ernest Rutherford
d)
Robert Millikan
20.
Idea was of an indivisible particle of matter he called "atomos"
a)
John Dalton
b)
Aristotle
c)
Democritus
d)
Plato
21.
Discovered the nucleus
a)
Democritus
b)
Robert Millikan
c)
James Chadwick
d)
Ernest Rutherford
22.

Who first had evidence of the atom?

a)

Bohr

b)

Dalton

c)

Rutherford

d)

Thompson

23.
Alpha particles.....
a)
a) are positively charged.
b)
b) consist of two protons and four neutrons.
c)
c) can penetrate any thickness of matter
d)
d) All of the above 
24.
In order of most to least penetrating radiation we have
a)
Alpha , Beta,  Gamma
b)
Beta , Gamma , Alpha
c)
Gamma, Beta, Alpha
d)
Gamma, Alpha, Beta
25.
Name the most penetrating type of radiation.
a)
alpha
b)
beta
c)
gamma
d)
lambda

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