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23 Cards in this Set
- Front
- Back
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element
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a substance that cannot be split into simpler substances
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physical properties
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the characteristics of a substance you can observe without changing the substance
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density
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the mass per unit volume of a substance
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distinctive
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having qualities that set one thing apart from others
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chemical properties
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the ways an element behaves with other elements
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atom
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the smallest part of an element that has the properties of that element
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protons
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the positively, charged particles in the nucleus of an atom
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nucleus
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the center part of an atom, which contains protons and neutrons
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electrons
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the negatively charged particles that circle the nucleus of an atom
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shells
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imaginary paths around the nucleus of an atom in which electrons move
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stable
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balanced and not easy to change
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react
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change chemically
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periodic table
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a chart that organizes elements by their properties
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atomic number
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the number of protons in the nucleus of one atom of an element
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chemical symbol
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an abbreviation for an element, usually made of one or two letters
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conductors
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materials that allow hear and electricity to pass through
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radioactive
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giving off high-energy particles
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group
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a column in the periodic table
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period
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a row in the periodic table
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patterns
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events that happen over and over
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chemical change
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a change in matter that results in the formation of a new substance
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material
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any substance from which something can be made
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materials scientists
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people who find new ways to use elements and compounds
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