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- 1. Multiple Choice
Why are all atomic masses not nearly whole numbers?
This is due to the mass of all the electrons in the atom.
This is because of experimental error.
This is because atomic masses are the weighted average of the masses of all naturally-occurring isotopes.
This is due to binding energy of the atoms.
- 2. Multiple Choice
The atomic number of an element is defined by its number of ________.
protons
neutrons
electrons
nuclei
- 3. Multiple Choice
The sum of the protons and neutrons in a nucleus is __________.
the atomic number
the mass number
Avogadro's number
the element number
- 4. Multiple Choice
Which of the following is true for any atom?
atomic number = number of protons = number of electrons
atomic number = number of neutrons = number of electrons
mass number = number of protons = number of electrons
mass number = number of protons = number of neutrons
- 5. Multiple Choice
How is the atomic mass unit (amu) defined?
1/12 the mass of a carbon-12 atom
1/14 the mass of a nitrogen-14 atom
1/13 the mass of a carbon-13 atom
1/16 the mass of an oxygen-16 atom
- 6. Multiple ChoiceHow many neutrons in C-14?67148
- 7. Multiple Choice
How many protons does this isotope of titanium have?48222670 - 8. Multiple ChoiceHow many neutrons does uranium-235 have?23892146143
- 9. Multiple ChoiceWhat quantities vary between isotopes of an element?protons, electrons, and atomic massprotons, electrons, and atomic numberneutrons and electronsneutrons and atomic mass
- 10. Multiple Choice
If an atom has 9 protons, 10 neutrons and 9 electrons, what is its atomic mass?
9
19
18
10
- Answer choicesTagsAnswer choicesTags