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17 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Atom |
The smallest part of an element |
Atoms make up everything |
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Atomic mass |
The mass of an atom in AMUs. The average mass of all natural isotopes |
The number at the bottom of the cell is the atomic mass |
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Atomic mass unit |
One-twelfth the mass of Carbon-12 |
Atomic mass is measured in atomic mass units |
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Atomic number |
The number of protons in an atom |
The atomic number identifies the element |
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Atomic symbol |
The letter or letters that identify an atom |
The symbol for germanium is Ge |
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Electron |
An elementary particle with a negative charge |
Electrons float around the nucleus |
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Group |
Elements of a vertical column in the periodic table |
Hydrogen is in the first group |
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Isotope |
Two or more atoms of the same element with different masses |
Hydrogen has three isotopes |
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Mass number |
The total number of protons and neutrons in an atom |
This fluorine has a mass number of 19 |
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Metal |
An element that tends to lose electrons in chemical reactions |
Metals tend to be shiny and malleable |
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Metalloid |
An element that has properties of metals and nonmetals |
Some metalloids look and act like metals |
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Neutron |
A neutral subatomic particle |
Neutrons are called neutrons because they're neutral. |
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Nonmetal |
An element that tends to gain electrons in chemical reactions |
Nonmetals are usually dull and brittle |
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Nucleus |
The center of an atom. Has mass and a positive charge |
The nucleus is made up of protons and neutrons |
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Period |
Elements of a horizontal row on the periodic table |
Helium is in the first period |
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Proton |
A subatomic particle with a positive charge |
Protons make the nucleus positive |
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Subatomic particle |
A particle that is smaller than an atom |
Protons, neutrons, and electrons are subatomic particles. |
