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25 Cards in this Set
- Front
- Back
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Define an atom. |
the smallest particle of an element that still retains the properties of its element. |
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A positively-charged particle |
Proton |
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A negatively-charged particle |
Electron |
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A neutral particle |
Neutron |
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Particles of matter that make up protons and neutrons |
Quarks |
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Area around the nucleus of an atom where the atom's electrons are most likely to be found |
Electron Cloud |
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The number of protons in an atom is equal to a number called |
Atomic Number |
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The sum of protons and neutrons equal to the |
Mass Number |
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The atomic number subtracted from the mass number is equal to the number of |
Neutrons |
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The arrangement of elements in an organized chart is called the |
Periodic Table |
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The vertical columns of elements in a periodic table is called a |
Group |
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The horizontal rows of elements in a periodic table is called a |
Period |
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Elements on a periodic table are arranged by order of |
increasing atomic number |
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A new row on a periodic table is formed when |
the outer energy level of an element is filled |
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In the periodic table, metals are found |
on the left |
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In the periodic table, nonmetals are found |
on the right |
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In the periodic table, metalloids are found |
along the line that separates the metals from the nonmetals |
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First person to have organized the periodic table |
Mendeleev |
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The number of groups (vertical columns) in the periodic table |
18 |
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The number of periods (horizontal rows) in the periodic table |
7 |
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An element is easily determined by |
its atomic number, or the number of its protons |
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The unit of measurement for atomic particles |
Atomic Mass Unit (amu) |
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Protons and neutrons can be found in the |
Nucleus |
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Electrons can be found in the |
Outer shells |
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The man who re-arranged the periodic table by order of increasing atomic number |
Moseley |
