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Total questions: 20

Worksheet time: 40mins

Name
Class
Date
1.

Which scientist discovered the electrons?

a)

Dalton

b)

Thomson

c)

Atristotle

d)

Bohr

2.

Bohr discovered that electrons are located in

a)

the nucleus

b)

inside protons

c)

electron cloud

d)

circular orbits around the nucleus

3.

What is a particle with one negative charge called?

a)

electron

b)

proton

c)

quark

d)

neutron

4.

The smallest particle of an element that still represents that element.

a)

Nucleus

b)

electron

c)

proton

d)

atom

5.

What is a particle with one positive charge called?

a)

proton

b)

electron

c)

neutron

d)

quark

6.

What is the center of an atom called?

a)

nucleus

b)

electron cloud

c)

proton center

d)

photon center

7.

What is the neutral particle found in the nucleus called?

a)

proton

b)

neutron

c)

electron

d)

quark

8.

All matter is made of

a)

energy

b)

atoms

c)

electrons

d)

compounds

9.
Matter always has mass.
a)
true
b)
false
10.
In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.
a)
Atoms
b)
Parts
c)
Molecules
d)
Hydrogen
11.

Who was the Greek philosopher who called the smallest particle of matter an "atom"?

a)

Democritus

b)

Aristotle

c)

J.J Thompson

d)

Einstein

12.

Which of the following is/are conclusions based on Rutherford’s gold foil experiment?

a)

Atom is mostly empty space

b)

The nucleus is positively charged

c)

The atom has a small dense nucleus

d)

All answers are correct

13.
Who is the scientist who proposed the "solar system" model of an atom where the electrons orbit around the nucleus?
a)
Democritus
b)
Niels Bohr
c)
Ernest Rutherford
d)
Chadwick
14.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
15.
What number indicates the nucleus?
a)
1
b)
2
c)
3
d)
4
16.
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.
17.
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
18.
Which of the following is NOT a part of Dalton's atomic theory?
a)
All elements are composed of atoms.
b)
Atoms are alwyas in motion.
c)
Atoms of the same element are always identical.
d)
Atoms that combine do so in simple, whole-number ratios.
19.

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

20.
What did James Chadwick discover?
a)
neutrons
b)
electrons
c)
the atomic theory
d)
protons

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