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10 Cards in this Set
- Front
- Back
The smallest particle of an element that retains all the properties of that element is electrically neutral. |
Atom |
|
The number of protons |
atomic number |
|
number of protons plus the number of neutrons |
mass number |
|
The weighted average mass of the isotopes of that element |
Atomic mass |
|
Atoms of the same element with the same number of protons but different number of neutrons. |
isotopes |
|
One-twelfth th mass of a carbon-12 atom |
atomic mass unit |
|
A negatively charged particle |
electron |
|
contains protons and neutrons |
Nucleus |
|
a positively charged particle |
proton |
|
A neutral subatomic particle in an atom nucleus that has a mass nearly equal to that of a proton. |
neutron |