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Unit B-2 Vocab

state of matter one of the four distinct forms that matter can take the shape of (ie solid, liquid, gas, plasma)
solid a state of matter where particles have a high force of attraction and weak energy
liquid a state of matter where particles have a moderate force of attraction and energy
gas a state of matter where particles have weak forces of attraction and high energy levels
atom an elementary particle; it is the smallest form in which an element retains its properties
proton a particle that emits positive charge (1 elementary mass)
neutron a particle that neither emits positive nor negative charge (1 elementary mass)
nucleus the 1% of matter in an atom; it contains the protons and neutrons of an atom
electron a particle that emits negative charge (1 elementary mass)
electron cloud the area in which electrons orbit the nucleus of an atom
valence electron a type of electron in the atom that is located in the outermost shell
Periodic Table of Elements groups/families of elements organized by AN, reactivity, properties
reactivity how reactive a certain element is when exposed to other elements
atomic number the number of protons found in the nucleus of a particular element
mass number the average weight of all of an element’s isotopes
atomic mass the average sum of the amount of protons and neutrons in each of the element’s isotopes
element a pure, simplified form of matter that partially comprises our world
Created by: lli32



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