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1st Semester Vocab

Atom the building block of matter
Element the most pure type of matter; it cannot be broken down
Nucleus the center of an atom
Electron Shell the outer shell of an atom in which electrons reside
Proton positively charged particle, in nucleus, defines atom
Neutron no charge in particle, in nucleus, different # makes an isotope
Electron negatively charged particle, in the electron cloud, different # makes an ion
Atomic Number determined by the amount of protons in an atom
Atomic Mass mass of an atom based on the mass of the protons and neutrons
Valence Electron the electrons in the outermost shell
Metal elements located in the middle and left side, that are usually solid and good conductors
Nonmetal elements located on the right side of the periodic table, that are poor conductors, and usually gases
Metalloid an element with both nonmetal and metal properties
Group column of elements that have the same number of valence electrons and chemical properties
Period row of elements that share the same # of electron shells
Transition Elements the elements in groups 3 to 12
Representative Elements the elements in groups 1-2 and 13-18
Ion forms when there are a different # of electrons
Isotope forms when there are a different # of neutrons
Force a push or a pull
Created by: w0501826
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