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Unit B-2 Vocab

Vocabulary for unit B-2

TermDefinition
state of matter an observable way that matter organizes itself
solid the most compact state of matter. least particle energy most force of attraction
liquid the middle state of matter, medium particle energy, medium force of attraction
gas the least compact. Most particle energy least force of attraction
atom the smallest form of matter still discernable as an element
proton a positively charged particle that helps make up atom
neutron a neutrally charged particle that help make up atoms
nucleus the command center of an atom
electron a negatively charged particle that helps make up an atom
electron cloud where electrons are when they float around the nucleus
valence electron the electrons that make up the outer shell of an atom
Periodic Table of Elements the way that scientists organize the elements
reactivity making some chemical change because of contact with another substance
atomic number the number of protons in the nucleus of an atom
mass number the total weight of protons and neutrons
atomic mass the average mass of all the forms of an element
element one of the building blocks of everything
Created by: dsmith48
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