Biology 1404 Final Exam Review [Distinction Level] Questions and Answers
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matter - -anything that takes up space and has mass -elements - -any substance that cannot be broken down into simpler substances -atom - -the basic smallest unit of a matter that has all the ch... emical properties of an element -proton - -A positively charged particle that is part of an atom's nucleus. -neutron - -A small particle in the nucleus of the atom, with no electrical charge -electrons - -Negatively charged subatomic particles found in various energy levels (orbital shells) around the nucleus -atomic number - -the number of protons in the nucleus of an atom -mass number - -the sum of the number of neutrons and protons in an atomic nucleus -atomic mass - -The average mass of all the isotopes of an element -isotopes - -Atoms of the same element that have different numbers of neutrons -periodic table - -A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together. -electron shells (energy levels) - -electrons occupy orbits or generally fixed regions of space around the nucleus. Atoms fill inner shells first (2 electrons) and then the next two electron shells have 8 electrons -valence shell - -outermost electron shell [Show More]
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