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21 Cards in this Set
- Front
- Back
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Matter
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anything that has mass and volume |
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mass
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a measure of how much matter an object contains. |
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volume
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the amount of space that an object takes up |
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atom
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the smallest basic unit of matter |
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element
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a substance that contains only a single type of atom. |
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proton |
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neutron |
an uncharged particle found in the nucleus of an atom. |
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nucleus
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the center of the atom that contains the protons and neutrons of the atom. |
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electrons |
negatively charged particles that move around outside the nucleus
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atomic number |
the number of protons in the nucleus |
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atomic mass |
the average mass of protons and neutrons found in the nucleus of an atom. |
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periodic table
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gives information about all the known elements and shows a repeating pattern of the properties of the elements. |
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Dmitri Mendeleev
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the father of the periodic table |
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periods
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the rows (horizontal) in the periodic table. |
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groups |
the columns (vertical) in the periodic table |
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reactive |
how likely an atom is to chemically react with another atom. |
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families |
one or more groups of elements that have similar physical and chemical properties. |
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alkali metals |
the most reactive metals |
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halogens |
the most reactive non-metals |
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Noble Gases |
inert (not reactive) gases; they never react with other elements. |
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orbitals |
the areas around an atom where electrons are most likely found |
