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Unit 2 Chemistry- the atom

Total questions: 52

Worksheet time: 20mins

Name
Class
Date
1.

What is the charge on a proton?

a)

+1

b)

-1

c)

0

2.

What is the charge of an electron?

a)

+1

b)

-1

c)

0

3.

What is the charge of a neutron?

a)

+1

b)

-1

c)

0

4.

Who was the first scientist who came up with the idea of atoms?

a)

Dalton

b)

Democritus

c)

Rutherford

d)

Schrodinger

5.

Who was the scientist who came up with the Uncertainty Principle?

a)

Rutherford

b)

Thomson

c)

Schrodinger

d)

Heisenberg

6.
John Dalton stated:
a)
elements are made of atoms
b)
atoms of a given element are identical
c)
atoms cannot be subdivided, created, nor destroyed
d)
all of the above
7.
The scientist responsible for "discovering" the nucleus is:
a)
Bohr
b)
Rutherford
c)
Schroedinger
d)
Einstein
8.

How did Rutherford discover the nucleus?

a)
Cathode tube ray experiment
b)
Gold Foil Experiment
c)
Planetary Model
d)
Plum Pudding Model
9.

Electrons orbit a certain distance from the nucleus. Either radiate or absorb energy when jumping orbitals.

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

10.

Atom is a positively charged cloud with embedded negative electrons

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

11.

What scientist proposed this atomic model?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

12.

What scientist proposed this atomic model?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

13.

In a famous experiment conducted by Ernest Rutherford, positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment?

a)

The nucleus is negatively charged

b)

The atom is a dense solid and is indivisible

c)

The mass is conserved when atoms react chemically

d)

The nucleus is very small and the atom is mostly empty space

14.

What subatomic particle was discovered in the cathode ray tube experiment?

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleus

15.

Who did the Cathode Ray Experiment

a)

Bohr

b)

Thomson

c)

Rutherford

d)

Milikin

16.
What scientist first developed 4 rules for atomic theory, and helped kick start modern chemistry?
a)
J.J. Tomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
17.
True or False: The majority of an atom is made up of empty space
a)
True
b)
False
18.
The central region of an atom where its neutrons and protons are is its 
a)
Nucleus 
b)
Electron Cloud
c)
Core 
d)
Center 
19.
Which is the correct sequence of the scientists who made major changes in the model of the atom?
1-JJ Thomson
2-Erwin Schrodinger
3-John Dalton
4-Niels Bohr
5-Ernest Rutherford
a)
2, 1, 4, 3, 5
b)
3, 1, 5, 4, 2
c)
5, 3, 2, 1, 4
d)
4, 3, 2, 1, 5
20.
Which of the following is proposed by Erwin Schrodinger?
a)
Solar system model of the atom
b)
Plum pudding model of the atom
c)
Billiard ball model of the atom
d)
Electron cloud model of the atom
21.

How many protons are in Gold

a)

79

b)

197

c)

118

d)

276

22.

How many electrons are in Gold

a)

79

b)

118

c)

197

d)

276

23.

How many neutrons are in Gold-195?

a)

79

b)

116

c)

197

d)

118

24.

What is the mass number of Gold-195?

a)

79

b)

116

c)

197

d)

195

25.

How many Neutrons are in Neon-21?

a)

10

b)

21

c)

20

d)

11

26.

How many protons are in Neon-21?

a)

10

b)

21

c)

20

d)

11

27.
An atom becomes _________ when it gains electrons.
a)
Positive
b)
Negative
c)
Neutral
d)
Invinsible
28.
An atom becomes _______ when it loses electrons.
a)
Positive
b)
Negative
c)
Neutral
d)
Invinsible
29.

Which particles change the charge in atoms when ions are formed?

a)

Protons

b)

Electrons

c)

Neutrons

30.
What is an isotope? 
a)
A charged atom
b)
An atom with different amounts of neutrons
c)
An atom with different amounts of protons
d)
A neutral atom
31.

How many neutrons does a Calcium-48 isotope have?

a)
16
b)
20
c)
28
d)
12
32.

How many protons does a Calcium-48 isotope have?

a)
16
b)
20
c)
28
d)
12
33.

An atom with a positive or negative charge is called an ______________.

a)

ion

b)

isotope

c)

polygon

34.

What is the charge of an atom with 3 protons and 2 electrons?

a)

+1

b)

-1

c)

0

35.

What is the charge of an atom that has 3 protons and 4 electrons?

a)

+1

b)

-1

c)

0

36.

What is the charge of an atom with 7 protons and 7 electrons?

a)

+1

b)

0

c)

-1

37.

An oxygen atom gains 2 electrons. What is the formula for this ion?

a)

O+2

b)

O-2

c)

O+4

38.

A Boron atom loses 3 electrons. What is the ion formula?

a)

B+3

b)

B-3

c)

B11

39.
An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?
a)
9.012, Beryllium
b)
12.011, Carbon
c)
6.941, Lithium
d)
10.812, Boron
40.

To calculate average atomic mass, you need

a)

the atomic mass of each isotope

b)

the percent abundance of each isotope

c)

the atomic mass and percent abundance of each isotope

d)

to find the average of the atomic masses of each isotope

41.
An isotope has three forms.  30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu.  Average atomic mass will be closest to
a)

3.7 amu

b)

3.0 amu

c)

4.0 amu

d)

5.0 amu

42.

Sulfur has 4 isotopes, Sulfur-32, Sulfur-33, Sulfur-34 and sulfur-36. The atomic mass of sulfur is 32.06. Which isotope is more abundant?

a)

Sulfur-32

b)

Sulfur-33

c)

Sulfur-34

d)

Not enough information to know.

43.

Which color is higher in energy?

a)

Red

b)

Green

c)

Violet

d)

yellow

44.

Which color is lower in energy?

a)

Red

b)

Green

c)

Violet

d)

yellow

45.

If an atom absorbs energy, it goes from _____ state to _____ state

a)

ground, excited

b)

excited, ground

46.

If an atom releases energy, it goes from _____ state to _____ state

a)

ground, excited

b)

excited, ground

47.

What is the mass number?

a)

Protons plus neutrons for isotope

b)

Weighted average of all isotopes

c)

Protons only

d)

Neutrons only

48.

What is the atomic mass on the periodic table?

a)

Protons plus neutrons for isotope

b)

Weighted average of all isotopes

c)

Protons only

d)

Neutrons only

49.

What two things are needed to calculated the atomic mass of an element?

a)

percent abundance of the isotope

b)

Mass number of the isotope

c)

Protons of the isotope

d)

Electrons of the isotope

50.
What does the nucleus of an atom contain?
a)
Electrons & Neutrons
b)
Protons & Neutrons
c)
Neutrinos & Positrons
51.

What is the atomic number of an element?

a)

The number of protons in the nucleus

b)

The number of neutrons in the nucleus

c)

The total number of protons and neutrons in the nucleus

d)

The total number of protons and electrons in an atom

52.
How many protons does Helium have?
a)
4
b)
4.0026
c)
2
d)
1

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