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Unit B-2 Vocab
Vocabulary for unit B-2
Term | Definition |
---|---|
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 |