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15 Cards in this Set
- Front
- Back
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How did chemist begin to organize the known elements? |
They used the properties of elements to separate them into groups |
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How did Mendeleev organize his periodic table? |
Arranged the elements in order of increasing atomic mass |
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The three broad classes of elements |
1) Metals 2) Nonmetals 3) Metalloids |
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Periodic Law |
When elements are arranged in order of increasing atomic number |
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Metal |
Good conductors of heat and electric currents |
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Nonmetals Nonmetals |
Poor conductors of heat and electric currents |
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Metalloids |
Have both Metal and Nonmetal characteristics |
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Representative Elements |
Display a wide range of physical\chemical properties |
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How do ions form? |
When electrons are transferred between atoms |
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Atomic Radius |
One Half of the distance between the nuclei of two atoms of the same element |
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Ion |
An atom that has a positive \ negative charge |
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Ca+ion (Cat-ion) |
Ion with a positive charge |
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Anion |
Ion with a negative charge |
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Ionization |
The energy needed to remove an electron from an atom |
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Electronegativity |
The ability of an atom of an element, to attract electrons in a compounds. |
