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WorksheetsAverage Atomic Mass (Test Review)
Total questions: 17
Worksheet time: 15mins
What is the mass number of this atom?
1
3
4
7
What is the atomic number of Barium, Ba? (enlarge the periodic table)
20
38
56
88
How many protons are in a sodium atom, Na? (tap to enlarge the periodic table)
Sodium has 1 proton.
Sodium has 3 protons.
Sodium has 11 protons
Atoms of the same element which have a different number of neutrons are called _________________.
ions
isotopes
quarks
molecules
The average atomic mass on the periodic table is found from...
calculating the weighted average mass of all the isotopes of that element
Calculating different types of elements together
calculations the average of all elements in that period together.
making a guess about how much all the isotopes might wiegh together.
The mass of an element is 15 and the number of protons is 7 how many neutrons does it have?
15
7
8
22
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?
15.99, Oxygen
10.81, Boron
10.81, Oxygen
15.99, Boron
Which of the following represents isotopes of the same element?
818O and 718O
919F and 1019Ne
919F and 919Ne
816O and 818O
What is the average atomic mass for thallium, Tl, if there are two isotopes with the following masses and abundances? Tl-203 has a mass of 203 amu with an abundance of 29.5 % Tl-205 has a mass of 205 amu with an abundance of 70.5 %
203.12 amu
204.31 amu
204.41 amu
204.0 amu
A sample of cesium is 75% Cs-133, 20% Cs-132, and 5% Cs-134. What is the average atomic mass?
132.97 amu
133.00 amu
133.16 amu
132.85 amu
To calculate average atomic mass, you need
the atomic mass of each isotope
the percent abundance of each isotope
the atomic mass and percent abundance of each isotope
to find the average of the atomic masses of each isotope
Calculate the average atomic mass of the element iron (Fe) using the following data:
[Isotope / % abundance]
[Iron 54 / 6% ] [Iron 56 / 92% ] [ Iron 57 / 2% ]
53.7 amu
54.9 amu
5592.0 amu
55.9 amu
