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18 Cards in this Set
- Front
- Back
- 3rd side (hint)
Atom |
The atom is the smallest unit that defines the chemical elements and their isotopes
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Solids, liquids, and gases are made up of atoms. |
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Atomic Mass |
The mass of an atomic particle, sub-atomic particle, or molecule |
Lithium has an atomic mass of 6.941 |
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Atomic Mass Unit |
The standard unit used to indicate the mass on an atomic scale |
The mass of one atom= exactly 12amu |
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Atomic Number |
The number of protons found in the nucleus of the atom in an element |
Lithium has the atomic number of 3 |
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Atomic Symbol |
The chemical symbol with the atomic number and mass number |
Helium's atomic symbol shows it's mass number(4) and it's atomic number(2) |
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Chemical Symbol |
The "code" for an element. Usually derived from the name |
Sodium a chemical symbol is Na |
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Electron |
A sub-atomic particle with a negative charge |
An electron is a small piece of matter and energy |
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Group |
A column of elements on the periodic table of elements |
Sodium and potassium are in the same group |
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Isotope |
Atoms of elements that have different numbers of neutrons |
A hydrogen isotope has 3 neutrons is called tritium |
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Mass Number |
The total number of protons and neutrons together |
Helium's mass number is 4 |
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Metal |
Any chemical element that is an efficient conductor of electricity and heat |
Iron and nickel are both metals but not phosphorus |
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Metalloid |
A chemical element that is a mixture of or is in between metals and nonmetals |
Silicon is a metalloid |
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Neutron |
A sub-atomic particle with no net charge |
Some elements have the same amount of neutrons as they do protons |
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Nonmetal |
An element that lacks most metallic attributes |
Hydrogen is a nonmetal |
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Nucleus |
The positively charged center of an atom containing protons and neutrons |
The electrons are not found in the nucleus |
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Period |
A row of elements with the same electron number of electron shells |
Hydrogen and helium are in the same period |
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Proton |
A sub-atomic particle with a positive charge |
Protons are found with electrons in the nucleus |
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Sub-atomic Particle |
Particles that are smaller than atoms |
A proton is a sub-atomic particle |
