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28 Cards in this Set
- Front
- Back
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Oxygen
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O - 65% of total body mass
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Carbon
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C - 18.5% of total body mass
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Hydrogen
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H - 9.5% of total body mass
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Nitrogen
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N - 3.2% of total body mass
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Calcuim
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Ca - 1.5% of total body mass
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Phosphorus
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P - 1.0% of total body mass
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Potassium
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K - 0.35% of total body mass
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Sulfur
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S - 0.25% of total body mass
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Sodium
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Na - 0.2% of total body mass
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Chlorine
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Cl - 0.2% of total body mass
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Magnesium
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Mg - 0.1% of total body mass
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Iron
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Fe - 0.005% of total body mass
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Trace elements
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0.2% of total body mass
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chemistry
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the science of the structure and interactions of matter
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matter
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anything that occupies space and has mass
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mass
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the amount of matter in any object, which does not change
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weight
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the force of gravity acting on matter, does change
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three states of matter
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solid, liquid, gas
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solids
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compact and have a definite shape and volume
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liquids
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have a definite volume and assume the shape of their container
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gases
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have neither a definite shape nor volume
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chemical elements
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a limited number of building blocks, that make up all forms of matter - both living and nonliving
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How many elements?
How many occur naturally on Earth? |
112 elements
92 occur naturally |
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chemical symbol
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one or two letters of the element's namein English, Latin, or another language
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How many elements are present in your body?
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26 different elements
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major elements
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4--constitute about 96% of the body's mass: oxygen, carbon, hydrogen, and nitrogen
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lesser elements
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8--contribute 3.8% to the body's mass: calcium-C, phosphorus-P, potassium-K, sulfur-S, sodium-Na, chlorine-Cl, magnesium-Mg, and iron-Fe
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trace elements
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14--account for the remaining 0.2% of the body's mass; iodine
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