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Understanding Atom

Total questions: 30

Worksheet time: 23mins

Name
Class
Date
1.
What does the nucleus of an atom contain?
a)
Electrons and neutrons
b)
Protons and neutrons
c)
Neutrinos and positrons
d)
DNA and RN
2.
The atomic number for Oxygen is 8, so
a)
there are 8 protons in the atom
b)
the atomic mass is less than 8
c)
the mass of the atom is 8
d)
the atom is decaying
3.
This is a negatively charged particle found outside the nucleus
a)
Electron
b)
Proton
c)
Neutron
4.
This particle is found in the nucleus and has a positive charge
a)
Electron
b)
Proton
c)
Neutron
5.
What is the mass number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
6.
What gives an atom mass?
a)
Protons & electrons in the nucleus
b)
electrons in the cloud
c)
protons & neutrons in the nucleus
d)
Protons & electrons in the cloud
7.
If an element has 6 protons, 7 neutrons, and 6 electrons, what type of charge does the element have?
a)
positive
b)
negative
c)
neutral
d)
imaginary
8.
If an atom has 24 protons and 24 electrons, what is the atomic number of this element?
a)
24
b)
48
c)
0
d)
42
9.
In an atom, what is the number of protons equal to?
a)
The number of electrons.
b)
The number of neutrons.
c)
The number of molecules.
d)
The number of nuclei.
10.
What is the atomic mass of an element with 40 protons, 40 electrons, and 46 neutrons?
a)
80
b)
6
c)
86
d)
Not enough information
11.
Isotopes have different numbers of
a)
protons
b)
neutrons
c)
electron
d)
properties
12.
How many electrons are in an atom with an atomic number of 50?
a)
5
b)
8
c)
50
d)
2
13.

Which scientist proposed this model for atoms?

a)

Dalton

b)

Democritus

c)

Rutherford

d)

Thomson

14.

Which of the following found that atoms have a nucleus?

a)

Aristotle

b)

Dalton

c)

Rutherford

d)

Thomson

15.

In _______, the atomic number increases by one.

a)

alpha decay

b)

beta decay

c)

gamma decay

d)

omega decay

16.

Which of the following determined that cathode rays are negatively charged?

a)

Aristotle

b)

Dalton

c)

Rutherford

d)

Thomson

17.

________ does not change an element into another element

a)

Alpha decay

b)

Beta decay

c)

Gamma decay

d)

Omega decay

18.

In 1896, the French scientist Henri Becquerel discovered

a)

light-emitting polymers

b)

a process to turn natural rubber into a hard, stretchable polymer

c)

radioactive decay

d)

how to make alloys

19.

Based on his research of the atom, James Chadwick concluded that

a)

a cathode ray has a negative charge

b)

the electrons are found in an electron cloud

c)

the nucleus contains neutrons as well as protons

d)

the mass of an atom is concentrated in its center

20.

Two neutral atoms that have the same atomic number and different mass numbers are

a)

ions

b)

isotopes

c)

alpha particles

d)

different elements

21.

An ion that has a negative charge is formed when an atom

a)

loses neutrons

b)

loses electrons

c)

gains neutrons

d)

gains electrons

22.

If an ion contains 10 electrons, 12 protons, and 13 neutrons, what is the ion's charge?

a)

-2

b)

-1

c)

+2

d)

+3

23.

The atomic number of iron is 26. One of the naturally occurring isotopes of iron is iron-59. How many neutrons are found in the nucleus of this isotope?

a)

30

b)

33

c)

56

d)

59

24.

What is a substance called that consists of a single type of atom?

a)

element

b)

quark

c)

proton

d)

molecule

25.

Who discovered electrons?

a)

Dalton

b)

Aristotle

c)

Democritus

d)

Thomson

26.

Bohr proposed that electrons are located in the

a)

nucleus

b)

electron cloud

c)

circular orbits around the nucleus

d)

quark

27.

The atomic number decreases by two.

a)

alpha decay

b)

beta decay

c)

gamma decay

d)

ion

28.

Area around an atomic nucleus where an electron is most likely to be found.

a)

electron cloud

b)

nucleus

c)

mass number

d)

atomic number

29.

Process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation.

a)

nuclear decay

b)

radioactive

c)

spontaneous

d)

isotope

30.

Describes elements that spontaneously emit radiation.

a)

radioactive

b)

isotope

c)

ion

d)

nuclear decay

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