General Biology - Chapter 2: The Chemical Context of Life
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Biology - -The study of life -matter - -anything that takes up space and has mass -element - -a substance that cannot be broken down to other substances by chemical reactions -molecule - -an ... electrically neutral group of two or more atoms held together by chemical bonds -Compound - -A substance consisting of two or more elements in a fixed ratio. -carbon, hydrogen, oxygen, nitrogen - -make up 96% of living matter -calcium, phosphorous, potassium, and sulfur - -make up remaining 4% of living matter -atom - -the smallest unit of matter that still retains the properties of an element -Atoms are composed of - -Protons with a positive charge, neutrons with no charge, and electrons with a negative charge -atomic nucleus - -An atom's dense central core, containing protons and neutrons. -Electrons form a ____ around the nucleus - -cloud -dalton - -A measure of mass for atoms and subatomic particles; the same as the atomic mass unit, or amu. -Neutron mass and proton mass are almost identical and are measured in - -daltons -atomic number - -the number of protons in the nucleus of an atom -atomic mass number - -the sum of the protons and neutrons in the nucleus -atomic mass - -the total mass of an atom [Show More]
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