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- 1. Multiple Choice
If the atomic mass is the number of protons and neutrons, and the atomic number is the number of protons, how
can the number of electrons be determined?
By subtracting the number of protons by the number of neutrons.
It is the same as the number of protons.
By subtracting the number of protons from the atomic mass.
By adding the protons and neutrons.
- 2. Multiple Choice
If the atomic number of Pb (Lead) is 82 and its atomic mass is 205, how many neutrons does it have?
123
82
205
287
- 3. Multiple Choice
Hydrogen has an atomic mass of 3 and atomic number of 1. How many protons and neutrons does hydrogen have?
3 protons and 1 neutron
1 proton and 2 neutrons
2 protons and 1 neutron
1 proton and 3 neutrons
- 4. Multiple Choice
Which element is the heaviest?
Na
Ar
Ca
O
- 5. Multiple Choice
Which atom has an atomic mass of 16?
Na
Ar
Ca
O
- 6. Multiple Choice
An atom has an atomic number of 11 and an atomic mass of 23. Which of the following statements is correct?
It has 11 protons and 11 neutrons.
It has 11 electrons and 12 protons.
It has 11 protons and 11 electrons.
It has 23 protons and 11 electrons.
- 7. Multiple Choice
Which of the following atoms has the greatest number of neutrons?
- 8. Multiple Choice
Which pair of particles contributes the most to the overall mass of the atom?
Electrons and protons
Protons and neutrons
Electrons and neutrons
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