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8th grade sience

vocab words for an 8th grade science class

TermDefinition
static electricity electricity produced by friction
electron an elementary particle with negative charge
proton a stable particle with positive charge equal to the negative charge of an electron
neutron an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus
nucleus the positively charged dense center of an atom
atomic number the order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral
isotope one of two or more atoms with the same atomic number but with different numbers of neutrons
mass number the sum of the number of neutrons and protons in an atomic nucleus
radioactive exhibiting or caused by radioactivity
stable not taking part readily in chemical change
electric charge the quantity of unbalanced electricity in a body (either positive or negative) and construed as an excess or deficiency of electrons
repel force or drive back
attract direct toward itself or oneself by means of some psychological power or physical attributes
particle a tiny piece of anything
alpha decay radioactive decay of an atomic nucleus that is accompanied by the emission of an alpha particle
beta decay radioactive decay of an atomic nucleus that is accompanied by the emission of a beta particle
element any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
orbit the (usually elliptical) path described by one celestial body in its revolution about another
gravity the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface
matter that which has mass and occupies space
Created by: lcor1989
Popular Physical Science sets

 



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