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electrons and atoms

Total questions: 55

Worksheet time: 53mins

Name
Class
Date
1.
Bohr's model of the atom proposed that ___.
a)
electrons move around the nucleus in fixed orbits
b)
neutrons move around the nucleus
c)
neutrons do not exist, but are just paired protons and electrons
d)
the nucleus spins
2.

Order the atomic models below from the oldest to the most recent.

a)

2, 1, 3, and 4

b)

1, 2, 4, and 3

c)

3, 2, 4, and 1

d)

3, 1, 2, and 4

3.
Which of the following correctly describes the electron cloud model?
a)
Electrons do not follow fixed orbits, but are found more frequently in areas around the nucleus.
b)
Electrons are found in fixed orbitals around a positive nucleus.
c)
All of an atom's mass is concentrated in the electron cloud around the nucleus.
d)
Electrons are evenly embedded throughout a positively charged sphere.
4.

Which orbital is shaped like a sphere?

a)

s

b)

p

c)

d

d)

f

5.

This energy level holds 8 electrons in total.

a)

1st

b)

2nd

c)

3rd

d)

4th

6.

This sublevel can hold up to 10 electrons?

a)

s

b)

p

c)

d

d)

f

7.

The 3rd energy level can hold up to ___ electrons

a)

8

b)

18

c)

14

d)

16

8.

Right before an electron can be placed in the 3 d-orbital, where must electrons go?

a)

2 to the 4 s orbital

b)

6 to the 4 p orbital

c)

10 to the 2 d orbital

d)

2 to the 3 f orbital

9.

An atom that has gained energy beyond normal is said to be ...

a)

excited

b)

energized

c)

naturalized

d)

grounded

10.

How does an atom give up excessive energy when dropping from a higher energy state to a lower state?

a)

a photon

b)

a positron

c)

an electron is expelled.

d)

a neutron is expelled.

11.

1s2 2s2 2p6 3s2 3p4: That would be which element?

a)

Sulfur

b)

Silicon

c)

Fluorine

d)

Oxygen

12.

What would the electron configuration be for Boron (Atomic #5)

a)

1s2 2s2 2p1

b)

1s2 2s3

c)

1s2 2s2 2p5

d)

1s4 2s1

13.
The electron configuration of an atom is 1s22s22p6.  The number of electrons in the atom is 
a)
3
b)
6
c)
8
d)
10
14.
What atom matches this electron configuration?
1s22s22p63s23p64s23d10
a)
Zinc
b)
Copper
c)
Nickel
d)
Germanium
15.
What electron configuration matches an oxygen atom?
a)
1s22s22p63s2, 3p64s23d104p5
b)
1s22s22p4
c)
1s22s22p6
d)
1s22s22p63s23p64s23d1
16.
What electron configuration matches an oxygen ion?
a)
1s22s22p63s2, 3p64s23d104p5
b)
1s22s22p4
c)
1s22s22p6
d)
1s22s22p63s23p64s23d1
17.

An individual orbital (one line on our practice charts) can at most hold how many electrons?

a)

1 electron

b)

2 electrons

c)

3 electrons

d)

4 electrons

18.
Which element is depicted from this atomic orbital diagram?
a)
Carbon
b)
Nitrogen
c)
Oxygen
d)
Phosphorus
19.
Which element is depicted from this orbital diagram
a)
Fluorine
b)
Neon
c)
Chlorine
d)
Argon
20.
Which is associated with more energy? 
a)
2p
b)
2s
c)
3p
d)
1s
21.
What atom matches this electron configuration?
1s22s22p63s2
a)
Neon
b)
Magnesium
c)
Aluminum
d)
Potassium
22.
What atom matches this electron configuration?
1s22s22p63s2
a)
Neon
b)
Magnesium
c)
Aluminum
d)
Potassium
23.
What electron configuration matches an oxygen atom?
a)
1s22s22p63s2, 3p64s23d104p5
b)
1s22s22p4
c)
1s22s22p6
d)
1s22s22p63s23p64s23d1
24.
The electron configuration of an atom is 1s22s22p6.  The number of electrons in the atom is 
a)
3
b)
6
c)
8
d)
10
25.
Identify the Electron Configuration for Aluminum (Al)
a)
1s2 2s2 2p6 3s2 3p1
b)
1s2 2s2 2p6 3s2 3p3
c)
1s2 2s2 2p6 3s2 4p1
26.
How many electrons can the first energy level hold?
a)
1
b)
2
c)
8
d)
0
27.
The electron configuration of an atom is 1s22s22p6.  The number of electrons in the atom is 
a)
3
b)
6
c)
8
d)
10
28.
Identify the Electron Configuration for Silicon (Si)
a)
1s2 2s2 2p6 3s2 3p2
b)
1s2 2s2 2p6 3s2 3p3
c)
1s2 2s2 2p6 3s2 4p1
29.
What element has 4 valance electrons and is located in period 3?
a)
Silicon
b)
Carbon
c)
Germanium
d)
Arsenic
30.
In a stable atom the amount of electrons is electron is equal to
a)
neutrons
b)
protons
c)
atomic mass
d)
neutrons + protons
31.
Which of the following best describes an electron?
a)
It has no charge and about the same mass as a proton
b)
It has a negative charge and much less mass than a proton
c)
It has a positive charge and much more mass than a neutron
d)
It has a negative charge and about the same mass as a neutron
32.
How are electrons arranged in an atom?
a)
In groups of five
b)
In energy levels
c)
By color
d)
By shape
33.
What is this element? 
1s22s22p63s23p6
4s23d104p6
a)
Argon
b)
Krypton
c)
Selenium
d)
Bromide
34.
Which sublevel (s,p,d,f) has the least amount of energy?
a)
f
b)
d
c)
p
d)
s
35.
How many orbitals are in the f sublevel
a)
1
b)
3
c)
5
d)
7
36.
Which of the following has the highest energy
a)
red
b)
orange
c)
green
d)
purple
37.
Which model describes electrons as orbiting around a central nucleus?
a)
Bohr
b)
Rutherford
c)
Quantum Mechanical 
d)
Plum Pudding 
38.
What are patterns made when excited electrons emit light of certain wavelengths?
a)
electromagnetic spectra
b)
atomic emission spectra
c)
spectroscopes
d)
prisms
39.
Bromine is found in which block?
a)
s
b)
p
c)
d
d)
f
40.
An orbital can at most hold how many electrons?
a)
1 electron
b)
2 electrons
c)
3 electrons
d)
4 electrons
41.
How many d orbitals are there in a given sublevel?
a)
1
b)
3
c)
5
d)
7
42.
Which scientist used his gold foil experiment to show that an atom has a small, central, positively charged nucleus that contains most of the atom's mass?
a)
Rutherford
b)
Bohr
c)
Thomson
d)
Dalton
43.
What scientist is best known for his "Plum Pudding" model of the atom?
a)
J.J. Tomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
44.

What is the atomic 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

45.

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

46.
A phosphorus atom has 15 protons and 16 neutrons. What is the mass number?
a)
15
b)
16
c)
31
d)
1
47.

Atoms of the same element which have a different number of neutrons are called _________________.

a)

ions

b)

isotopes

c)

quarks

d)

molecules

48.

How many neutrons does C-14 [atomic #6] contain? (tap to enlarge the image)

a)

6

b)

7

c)

14

d)

8

49.

How many neutrons does an atom of the isotope Neon-22 have? (tap to enlarge the image)

a)

12

b)

10

c)

22

d)

20

50.

How many neutrons does an atom of Nitrogen-13 have? (tap to enlarge the image)

a)

6

b)

7

c)

13

d)

5

51.

The number in Kr-84 represents what about Krypton?

a)

The number of electrons

b)

The number of protons

c)

The mass number

52.
If X is the symbol for an element, which of the following two symbols represent    isotopes of the same element?     I. 7735X  II. 7733X  III. 8137X  IV. 8135 X
a)
I and II
b)
III and IV
c)
I and IV
d)
I and III
53.
How many neutrons does the isotope below have?     89 36Kr
a)
53
b)
36
c)
89
d)
125
54.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
55.

What is the mass number?

a)

the number of protons

b)

the number of protons plus neutrons

c)

the number of neutrons

d)

the number of protons and electrons

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