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Matter & PT Elements

unit review/study flashcards

TermDefinition
Matter anything that has mass and takes up space.
Atom the smallest piece of an element that still has the properties of that element.
Element a substance that cannot be broken down into a simpler substance by ordinary means. Example: hydrogen.
Mixture contains more than one element or compound spread among each other. Mixtures have the properties of the substances they are made of. Mixtures can be separated without a chemical change, example by filtering.
Compound made of two or more different kinds of atoms joined together (by a chemical reaction). Compounds have properties which are different from those of the elements they are made of.
Physical Change change where a physical property of matter is altered, but the substance remains the same kind of matter.
Chemical Change change matter undergoes when it turns into a new substance.
Atomic Number elements are arranged in order by their atomic number. The atomic number represents the number of protons in the nucleus of the atom/element.
Atomic Mass (weight) the number of protons and neutrons in the nucleus of an atom. (rounded to the nearest whole number for our class.)
Proton a positively charged subatomic particle inside the nucleus of an atom.
Neutron a neutral subatomic particle inside the nucleus of an atom.
Electron a negatively charged subatomic particle found outside of the nucleus of an atom.
Nucleus the center of an atom where protons and neutrons are located and contains the majority of mass for an atom.
Created by: user-1748754
 

 



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