WorksheetsAtoms (Protons, Neutrons Electtons, Isotopes Average Atomic Mass
Total questions: 66
Worksheet time: 3hrs 39mins
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.
What is the average mass of this element?
74.92 amu
24.97 amu
75.01 amu
74.51 amu
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?
32
33
34
no way to know
Calcium has three different isotopes. One has a mass of 35.00 amu; another has a mass of 41.00 amu; and another has a mass of 40.00 amu. Which isotope is the most abundant of the three?
40.00 amu
41.00 amu
35.00 amu
impossible to tell
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?
36.33 amu
37.00 amu
12.11 amu
impossible to tell
An element with 4.35% have a mass of 49.9461 amu, 83.79% have amass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389amu.
51.99 amu
52.19 amu
53.45 amu
17.33 amu
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?
41.97 amu
42.19 amu
10.43 amu
40.04 amu
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
2 amu
3 amu
4 amu
5 amu
Calculate the average atomic mass of silver.
106.38649amu
111.91896amu
107.8677amu
121
Nitrogen has three occurring isotopes: Nitrogen-13, Nitrogen-14, Nitrogen-15. Which isotope is the most abundant?
Nitrogen-13
Nitrogen-14
Nitrogen-15
Based on the information given, it cannot be determined
Ions are:
atoms with a positive or negative charge
atoms with no charge
atoms with ONLY a positive charge
atoms with ONLY a negative charge
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?
9.012, Beryllium
12.011, Carbon
6.941, Lithium
10.812, Boron
A neutral atom of Carbon-13 has ________ electrons and _________ neutrons
13, 13
6, 7
7, 7
6, 6
The mass of an atom is located in the ___________ and the volume of an atom is made of the ____________
electron cloud, nucleus
electron cloud, energy levels
nucleus, electron cloud
nucleus, neutrons
Do the following atoms belong to the same element? Explain
Aluminum-27
An atom with 14 protons and 13 neutrons
Yes because they have the same number of protons
Yes because they have the same mass
No because they have different number of protons
No because they have different number of neutrons
What do carbon-12 and carbon-14 have in common?
they have same number of protons
they have the same number of neutrons
they have the same atomic mass
they have the same atomic weight
What does the 1.00794 stand for?
Hydrogen
atomic number
atomic mass
atomic explosion
What is the atomic number for an element with three protons?
2
1
3
6
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
2 amu
3 amu
4 amu
5 amu
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?
9.012, Beryllium
12.011, Carbon
6.941, Lithium
10.812, Boron
Compute the average atomic mass for silicon:
27.977
28.09
28.976
The average mass cannot be determined from provided information.
A neutral atom of Carbon-13 has ________ electrons and _________ neutrons
13, 13
6, 7
7, 7
6, 6
Isotopes are atoms of the same element that have the same number of __________ but different number of __________ . Therefore, isotopes of the same element have different masses.
protons, neutrons
protons, electrons
neutrons, protons
electrons, protons
The mass of an atom is located in the ___________ and the volume of an atom is made of the ____________
electron cloud, nucleus
electron cloud, energy levels
nucleus, electron cloud
nucleus, neutrons
What is the atomic number of Neon, Ne?
10
20.1798
10.1798
7
A neutral atom of the isotope 2612Mg would consist of
12 protons, 26 neutrons, 26 electrons
26 protons, 12 neutrons, 26 electrons
26 protons, 14 neutrons, 14 electrons
12 protons, 14 neutrons, 12 electrons
A neutral atom would become an ion that has a charge of 2+ by
Losing two protons
Losing two neutrons
Losing two electrons
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?
41.97 amu
42.19 amu
10.43 amu
40.04 amu
Naturally occurring chlorine that is put in pools is 75.53 percent 35Cl (mass = 34.969 amu) and 24.47 percent 37Cl (mass = 36.966 amu). Calculate the average atomic mass.
35.46 amu
35.00 amu
37.00 amu
17.00 amu
An element with 4.35% have a mass of 49.9461 amu, 83.79% have amass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389amu.
51.99 amu
52.19 amu
53.45 amu
17.33 amu
The atomic mass of an element is the ___.
average of the mass number and the atomic number for the element
weighted average of the masses of the isotopes of the element
total mass of the isotopes of the element
total number of subatomic particles in the nucleus
Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37, The atomic mass of chlorine is 35.45. Which of these two isotopes of chlorine is more abundant?
Cl-35
Cl-37
Cannot be determined from the information provided.
An element has three isotopes. Given the abundances and relative masses, calculate the average atomic mass and determine (from the periodic table) which element it is.
Abundances | Relative masses
0.005% | 234.04 amu
0.720% | 235.04 amu
99.275% | 238.05 amu
Uranium (#92, Atomic Mass: 238.03 amu)
Fluorine (#9, Atomic Mass: 19.00 amu)
Mercury (#89, Atomic Mass: 200.59 amu)
Polonium (#84 209 amu)
Element Z has 2 natural isotopes. One isotope has a mass of 15.0 amu and a relative abundance of 30%. The other isotope has a mass of 16.0 amu and a relative abundance of 70%. Estimate the average atomic mass for this one element.
15.0 amu
16.0 amu
15.7 amu
16.9 amu
Calcium has three different isotopes. One has a mass of 35.00 amu; another has a mass of 41.00 amu; and another has a mass of 40.00 amu. Which isotope is the most abundant of the three?
40.00 amu
41.00 amu
35.00 amu
impossible to tell
What is the mass of a carbon atom that has 6 protons, 7 neutrons, and 6 electrons?
6
7
13
19
An atom of tin has an atomic number of 50 and a mass number of 119. How many protons, electrons, and neutrons are found in one neutral atom of tin?
50 protons, 69 electrons, 50 neutrons
50 protons, 50 electrons, 69 neutrons
69 protons, 50 electrons, 69 neutrons
69 protons, 69 electrons, 50 neutrons
Subatomic particles with a negative charge
Electrons
Neutrons
Protons
Quarks
How many neutrons does calcium have?
20
40
60
0
Atoms of the same element with different numbers of neutrons are called
Ions
Isotopes
Iotas
Introns
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
Which subatomic particle determines the identity of an element?
protons
neutrons
electrons
An atom that has a different number of protons and electrons is a(n)
Neutral Atom
Ion
Isotope
proton
positive charge
neutron
no charge
electron
negative charge
How many protons?
92
235
143
How many electrons are in Sulfur?
32
16
48
8
Which would you do to change this Lithium to a new element?
Add a neutron
Add an electron
Add a proton
Add a proton and neutron\
An atom that has more protons then electrons are called
cations
anions
isotopes
molecules
Isotopes are atoms with a different number of
protons
electrons
neutrons
atoms
Potassium is a metal, therefore it will
lose electrons
gain electrons
How is average atomic mass determined?
By adding all of the protons and neutrons together.
by summing the masses of the element's isotopes, each multiplied by its natural abundance on Earth
By multiplying of often protons and neutrons occur and adding up the averages.
What are AMU's
Atomic Mass University
Atomic Mass Units
Atoms mean unity
All Mass United
If an atom has 5 protons and 6 neutrons what is the proper name of the isotope?
Boron-1
Boron-11
Carbon-11
Carbon 11
Boron Carbonate
Which atom will have a +1 charge?
3 protons
4 neutrons
3 electrons
3 protons
4 neutrons
4 electrons
3 protons
4 neutrons
2 electrons
3 protons
3 neutrons
3 electrons
How many electrons are present in this atom?
36
17
19
18
Potassium-39 has how many neutrons?
19
18
20
21
76 protons and 114 neutrons
Osmium-114
Osmium-76
Osmium-190
Osmium-190.23
9 protons and 9 neutrons
Fluorine-18
Fluorine-9
Fluorine-16
Fluorine-18.998
What is the difference between Neon-20 and Neon-22?
They have different numbers of electrons.
They have different numbers of neutrons.
Only 1 is radioactive.
No difference.
ALL atoms of the same element have:
same number of proton
same number of nucleon
different number of neutron
different number of electron
Which is true of the following beryllium atom?
4 protons and 9 neutrons
5 neutrons and 4 electrons
9 protons and 4 neutrons
4 protons and 2 electrons
The nuclear symbol for an element is, 7735X . Match the following information:
Atomic Number
35
Mass Number
77
Neutrons
42
