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Chapter 7 Understanding the Atom

Total questions: 62

Worksheet time: 34mins

Name
Class
Date
1.

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

a)

Aristotle

b)

Dalton

c)

Rutherford

d)

Thomson

2.

In an atom, electrons ____.

a)

are located in the nucleus

b)

are paired with neutrons

c)

travel outside the nucleus

d)

are always in the same place in an atom

3.

Who proposed this model of atoms?

a)

Dalton

b)

Democritus

c)

Rutherford

d)

Thomson

4.

Which scientist developed this model for atoms?

a)

Dalton

b)

Democritus

c)

Rutherford

d)

Thomson

5.

The energy levels of an atom are occupied by _____.

a)

electrons

b)

protons

c)

neutrons

d)

ions

6.

The nucleus of an atom consists of _________________________.

a)

electrons

b)

neutrons

c)

protons and neutrons

d)

protons, neutrons, and electrons

7.

The three basic components of an atom are _______________.

a)

protons, neutrons, and ions

b)

protons, neutrons, and electrons

c)

protons, neutrinos, and ions

d)

protium, deuterium, and tritium

8.

If two atoms have the same number of protons but different numbers of neutrons, they will have the same ____.

a)

half-life

b)

mass number

c)

atomic number

d)

degree of stability

9.

Which of the following statements about the atom is false?

a)

Each atom has a tiny nucleus at its center.

b)

All the protons and neutrons are located in the nucleus.

c)

Electrons travel in definite circular pathways around the nucleus.

d)

All atomic nuclei are positively charged.

10.

What was on the photographic plate in Becquerel’s drawer with the uranium?

a)

an image of the mineral

b)

a sun spot

c)

Becquerel's fingerprints

d)

Nothing. It was clean.

11.

Which item best represents Thomson’s mental image of an atom?

a)

a sponge

b)

a chocolate-chip cookie

c)

a bowling ball

d)

a beach ball

12.

Which particles have almost the same mass?

a)

proton and electron

b)

proton and neutron

c)

electron and neutron

d)

all 3 particles

13.

Which item best represents Dalton's mental image of an atom?

a)

a cork

b)

a candy bar with nuts

c)

a marble

d)

a balloon full of air

14.

________ does not change an element into another element.

a)

alpha decay

b)

beta decay

c)

gamma decay

d)

omega decay

15.

Which two particles would be attracted to each other?

a)

electrons and neutrons

b)

electrons and protons

c)

protons and neutrons

d)

all particles are attracted to each other

16.

The particles that make up an atom are ____.

a)

electrons, protons, and nuclei

b)

elements, protons, and electrons

c)

protons, neutrons, and nuclei

d)

protons, neutrons, and electrons

17.

Which of the following found that atoms have a nucleus?

a)

Aristotle

b)

Dalton

c)

Rutherford

d)

Thomson

18.

When Rutherford performed his metal foil experiment, he was surprised that most of the alpha particles ____.

a)

were deflected by the foil

b)

bounced back from the foil

c)

were absorbed by the foil

d)

passed straight through the foil

19.

In _____, the atomic number increases by one.

a)

alpha decay

b)

beta decay

c)

gamma decay

d)

omega decay

20.

Based on his experiment, Rutherford concluded that atoms were ____.

a)

dense positively charged particles

b)

uniform throughout

c)

mainly empty space

d)

made of protons, neutrons, and electrons

21.

Henri Becquerel accidentally discovered radiation while working with minerals containing _____.

a)

polonium

b)

radium

c)

sodium

d)

uranium

22.

How many carbon atoms would fit in the period at the end of a sentence?

a)

7.5 thousand

b)

7.5 million

c)

7.5 billion

d)

7.5 trillion

23.

Which of the following is NOT a developer of an atomic model?

a)

Dalton

b)

Planck

c)

Rutherford

d)

Thomson

24.

Becquerel thought that _____ was necessary for minerals to give off energy that passed through paper.

a)

water

b)

sunlight

c)

dirt

d)

uranium

25.

Which of the following was invented in 1981 and allowed scientists to first see individual atoms?

a)

scanning tunneling microscope

b)

atomic microscope

c)

scanning telescope

d)

visualizing microscope

26.

A certain atom has 26 protons, 26 electrons, and 30 neutrons. It mass number is ____.

a)

26

b)

30

c)

52

d)

56

27.

Which of the following statements best describes how the Bohr model of an atom is different from this one?

a)

Bohr’s model had more electrons around the nucleus.

b)

Bohr’s model shows electrons at certain distances from the nucleus.

c)

Bohr’s model placed the electrons in the nucleus.

d)

Bohr’s model did not distinguish positive and negative charges.

28.

A single proton has which electrical charge?

a)

no charge

b)

positive charge

c)

negative charge

d)

either a positive or negative charge

29.

In _______, the atomic number decreases by two.

a)

alpha decay

b)

beta decay

c)

gamma decay

d)

omega decay

30.

Which scientists proposed this model for atoms?

a)

Dalton

b)

Democritus

c)

Rutherford

d)

Thomson

31.
What does the nucleus of an atom contain?
a)
Electrons and neutrons
b)
Protons and neutrons
c)
Neutrinos and positrons
d)
DNA and RN
32.
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
33.
This is a negatively charged particle found outside the nucleus
a)
Electron
b)
Proton
c)
Neutron
34.
This particle is found in the nucleus and has a positive charge
a)
Electron
b)
Proton
c)
Neutron
35.
This particle is found in the nucleus and has no charge
a)
Neutron
b)
Proton
c)
Electron
36.
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
37.
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
38.
The number of protons is equal to 
a)
the atomic number
b)
the number of neutrons
c)
the energy levels
d)
the periodic table groups
39.
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
40.
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
41.
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.
42.
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
43.
Isotopes have different numbers of
a)
protons
b)
neutrons
c)
electron
d)
properties
44.
If an atom has 10 electrons, how many protons does it have?
a)
0
b)
1
c)
10
d)
5
45.
How many electrons are in an atom with an atomic number of 50?
a)
5
b)
8
c)
50
d)
2
46.
Which subatomic particle has a negative charge in the atom?
a)
proton
b)
neutron
c)
electron
d)
quark
47.

Which of the following methods would be most useful for describing atoms?

a)

visualizing with a microscope

b)

constructing a model

c)

observing in a test tube

d)

touching with bare hands

48.

Democritus believed that the universe was made of empty space and __________ .

a)

molecules

b)

compounds

c)

elements

d)

atoms

49.

What nineteenth century scientist designed the atomic theory of matter?

a)

J.J. Thomson

b)

Ernest Rutherford

c)

John Dalton

d)

Isaac Newton

50.

Why did J.J. Thomson conclude that cathode rays were made up of small particles that had mass?

a)

They were bent by a magnet.

b)

The metal plates in his experiment had no net charge.

c)

Some of the rays changed direction and bounced back.

d)

He could see individual particles traveling from the negatively charged plate to the positively charged plate.

51.

The small, negatively charged particles discovered by J.J. Thomson are called __________ .

a)

protons

b)

neutrons

c)

electrons

d)

alpha particles

52.

James Chadwick named the uncharged particles in the atomic nucleus

a)

protons

b)

electrons

c)

neutrons

d)

alpha particles

53.

Atoms of the same element that have different numbers of neutrons are called __________.

a)

isotopes

b)

metals

c)

nonmetals

d)

metalloids

54.

An element's atomic number is the number of __________ in the nucleus of each atom of that element.

a)

neutrons

b)

protons

c)

electrons

d)

positrons

55.

Most of an atom's mass is contained in __________.

a)

the electron orbits

b)

the electron cloud

c)

its outer energy shell

d)

its nucleus

56.

A(n) __________ is an atom that has gained or lost an electron and is no longer neutral.

a)

ion

b)

isotope

c)

molecule

d)

compound

57.

__________ is the release of nuclear particles and energy.

a)

Transmutation

b)

Atomic half-life

c)

Nuclear decay

d)

Carbon dating

58.

Scientists have broken down protons and neutrons into smaller particles called __________ .

a)

nuclei

b)

quarks

c)

vacuoles

d)

isotopes

59.

Aristotle and many ancient Greeks thought that all matter was made of how many elements?

a)

1

b)

4

c)

8

d)

12

60.

Which researcher's experiments led to the discovery of the proton?

a)

John Dalton

b)

Neils Bohr

c)

James Chadwick

d)

Ernest Rutherford

61.

A calcium ion has 20 neutrons, 20 protons, and 18 electrons. What is the ion's charge?

a)

2+

b)

1+

c)

1-

d)

2-

62.

What part of an atom did Thomson discover?

a)

the electron

b)

the proton

c)

the nucleus

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