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30 Cards in this Set

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Energy Level
a region around the nucleus of an atom where electrons are most likely to be found; only a certain number of electrons can be found in each level of an atom
Neutron
an uncharged particle found in the nucleus of an atom
Electrons
a subatomic particle in an atom that is negatively charged and that occupies the energy levels in an atom; electrons are invoved in chemical bonds and reactions
Nucleus
the center core of an atom that contains protons and neutrons
Element
substances that contain only one kind of matter
Atomic Mass
the average mass of all the know isotopes of an element
Atomic Number
the number of protons that an taom contains
Atom
the smallest particle of an element that can exist alone or in combination with other atoms
Molecule
the smallest particle of a compund that retains the properties of the compound
Compund
substances made of two or more elements that cannot be seperated by physical means
Matter
anything that has mass and takes up space
Brittleness
a mesure of a material's tendency to shatter upon impact
Elasticity
a measure of a solid's ability to stretch and then return to it's original shape and size
Hardness
measures a solid's resistance to scratching
Malleability
a solid's ability to be pounded into thin sheets
Density
a propery that describes the relationship between mass and volume
Condensation
the process by which a substance in its gaseous state loses energy and enters its liquid state; one phase in the water cycle
Evaporation
the process by which a substance in its liquid state gains evergy and enters its gaseus state; one phase of the water cycle
Mass
a measure of the inertai of an object; the amount of matter an object has
Archimedes Priciple
a principle that states that the force exerted on an object in a liquid is equal to the weight of the fluid displaced by the object
Buoyancy
a measure of the upward force a fluid exerts on an object
Viscosity
a measure of a materials resistance to flow
Valence Electrons
the electrons in an atom that are invoved in the formation of chemical bonds
Ions
an atom that has an electrical charge
Electronegativity
tje attraction an atom has for the shared pair of electrons in a chemical bond
Covalent Bond
a type of chemical bond that is formed when two atoms share electrons
Ionic Bond
a type of chemicl bond between atoms that gained or lost electrons; a bond between ions
Octet Rule
states that atoms form bonds with tother atoms by sharing or transferring them to complete their octet and become stable
Binary Compunds
a covalent compund that consists of only two types of elements
Polyatomic Ions
ions that contain more than one type of atom