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- 1. Fill in the Blank
the smallest unit of an element that has all the chemical properties of that element
- 2. Fill in the Blank
a unit of mass that is equal to one twelfth the mass of a Carbon-12 atom.
- 3. Fill in the Blank
the number of protons in the nucleus of an atom
- 4. Fill in the Blank
the weighted average of the atomic mass of each isotope of the element, in proportion to the percentage of each isotope of the element occurring in nature
- 5. Fill in the Blank
a negatively charged subatomic particle that exists in various energy levels outside the nucleus of an atom
- 6. Fill in the Blank
an atom of the same element with the same number of protons but a different number of neutron
- 7. Fill in the Blank
the total number of neutrons and protons in an atom
- 8. Fill in the Blank
a charge of the same sign as that of an electron
- 9. Fill in the Blank
a subatomic particle with no electric charge that is located within the nucleus of the atom
- 10. Fill in the Blank
a charge of the same sign as that of a proton, often due to a deficit of electrons
- 11. Fill in the Blank
a subatomic particle with a positive charge that is located in the nucleus of an atom
- 12. Fill in the Blank
relating to something having dimensions (size) smaller than that of an atom itself
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