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| All known elements displayed in order of atomic number |
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How much an atom weighs
DIFFERENT from mass number |
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| Number of protons in the atom |
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Definition
All of the elements in a column of the periodic table
Columns are vertical (up and down) |
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Definition
All of the elements in a row of the periodic table
Rows are horizontal (left to right) |
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| Atom’s ability to attract electrons in a bond |
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| Negatively charged subatomic particle located outside the nucleus of the atom |
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Definition
Electrons which are found in the outermost energy levels, furthest from the nucleus of the atom
These electrons influence bonding and reactions |
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