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WorksheetsAtoms, Isotopes, Charge and Average Atomic Mass
Total questions: 23
Worksheet time: 28mins
Name
Class
Date
1.
How many neutrons are in an atom of carbon-14?
a)
6
b)
8
c)
10
d)
14
2.
How many protons does this isotope of titanium have?
a)
22
b)
26
c)
48
d)
70
3.
How many electrons are in an atom that has an atomic number of 34, an atomic mass of 74 and a charge of -2?
a)
2
b)
34
c)
36
d)
40
4.
Write the hyphen notation for the isotope that has 39 protons and 50 neutrons.
a)
Yttrium-11
b)
Tin-39
c)
Tin-89
d)
Yttrium-89
5.
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
6.
Four isotopes of lead include lead-204, lead-206, lead-207, and lead-208. The average atomic mass of lead is 207.2. Which isotope of lead is likely to be the most abundant.
a)
204
b)
206
c)
207
d)
208
7.
What is the name of the pictured isotope?
a)
Carbon-12
b)
Carbon-13
c)
Carbon-14
d)
Carbon-15
8.
4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?
a)
41.97 amu
b)
42.19 amu
c)
10.43 amu
d)
40.04 amu
9.
Compute the average atomic mass for silicon:
a)
27.977
b)
28.09
c)
28.976
d)
The average mass cannot be determined from provided information.
10.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
How many protons does this element have?
How many protons does this element have?
a)
32
b)
33
c)
34
d)
no way to know
11.
An element has three different isotopes. One has a mass of 35.00 amu; another has a mass of 36.00 amu; and another has a mass of 38.00 amu. What is the average atomic mass of this element?
a)
36.33 amu
b)
37.00 amu
c)
12.11 amu
d)
impossible to tell
12.
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)
2 amu
b)
3 amu
c)
4 amu
d)
5 amu
13.
Calculate the average atomic mass of silver.
a)
106.38649amu
b)
111.91896amu
c)
107.8677amu
d)
121
14.
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
15.
What is the name of the atom pictured here?
a)
Nitrogen
b)
Nitrogen-15
c)
Nitrogen-7
d)
Nitrogen-8
16.
Which of the following could have 82 neutrons?
a)
W-182
b)
Ta-181
c)
Cs-132
d)
Ba-138
17.
If an atom loses electrons, the charge will be positive.
a)
true
b)
false
18.
A Bromine ion gains 1 electron, which of the following is the correct symbol for a Bromine ion?
a)
Br-1
b)
Br+1
c)
Br+7
d)
Br-7
19.
An atom becomes _______ when it loses electrons.
a)
Positive
b)
Negative
c)
Neutral
d)
Invinsible
20.
What is the charge of an atom that has lost one electron?
a)
-1
b)
-2
c)
+1
d)
+2
21.
What is the charge of an atom that has gained one electron?
a)
-1
b)
-2
c)
+1
d)
+2
22.
How many total electrons does O-2 (an oxide ion) have?
a)
8
b)
10
c)
6
d)
18
23.
How many total electrons does Na+1 (a sodium ion) have?
a)
10
b)
11
c)
12
d)
22
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