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The Nature of Matter

6th grade science

actinide the second series of inner transition elements which goes from thorium to lawrencium
alkali metals elements in group 1 of the periodic table
alkaline earth metals elements in group 2 of the periodic table
Archimedes' principle states that the buoyant force on an object is equal to the weight of the fluid displaced by the object
atomic mass average mass of an atom of an element' its unit of measure is the atomic mass unit, which is 1/12 the mass of a carbon-12 atom
atomic number number of protons in the nucleus of each atom of a given element; is the top number in the periodic table
buoyant force upward force exerted on an object immersed in a fluid
catalyst substance that can make something happen faster but is not changed itself
chemical change change in which the composition of a substance changes
chemical property characteristic that cannot be observed without altering the sample
compound a substance produced when elements combine and whose properties are different from each of the elements in it
condensation the process of changing from a gas to a liquid
density mass of an object divided by its volume
deposition the process by which a gas changes into a solid
electron negatively-charged particle that exists in an electron cloud formation around an atom's nucleus
eletron cloud region surrounding the nucleus of an atom, where electrons are most likely to be found
element substance that cannot be broken down into simpler substances
freezing change of matter from a liquid state to a solid state
gas matter that does not have a definite shape or volume; has particles that move at high speeds in all directions
group family of elements in the periodic table that have similar physical or chimical properties
halogen elements in group 17 of the periodic table
heat movement of thermal energy from a substance at a higher temperature to a substance at a lower temperature
isotopes two or more atoms of the same element that have different numbers of neutrons in their nuclei
lanthanide the first series of inner tansition elements which goes from cerium to lutetium
law of conservation of mass states that mass is neither created nor destroyed--and as result the mass of the substances before a physical or chemical change is equal to the mass of the substancs present after the change
liquid matter with a definite volume but no definite shape that can flow from one place to another
mass number sum of the number of protons and neutrons in the nucleus of an atom
matter anything that takes up space and has mass
melting change of matter from a solid state to a liquid state
metal element that is malleable, ductile, a good conductor of electricity, and generally has a shiny or metallic luster
metalloid element that shares some properites with both metals and nonmetals
mixture a combination of compounds and elements that has not formed a new substance and whose proportions can be changed without changing the mixture's identity
neutron electrically-neutral particle that has the same mass as a proton and is found in an aotm's nucleus
noble gases elements in group 18 of the periodic table
nonmetal element that is usually a gas or brittle solid at room temperature and is a poor conductor of heat and electricity
Pascal's principle states that when a force is applied to a confined fluid, an increase in pressure is transimitted euqally to all parts of the fluid
period horizontal row of elements in the periodic table whose properties change gradually and predictably
physical change change in which the form or appearance of matter changes, but not its composition
physical property characteristic that can be observed, using the five sense, without changing or trying to change the composition of s substance
pressure force exerted on a surface divided by the total area over which the force is exerted
proton positively-charged particle in the nucleus of an atom
representative elements elements in groups 1 and 2 and 13-18 in the periodic table that include metals, metalloids, and nonmetals
semiconductor element that does not conduct electricity as well as a metal but conducts it better than a nonmetal
solid matter with a definite shape and volume; has tightly packed particles that move mainly by vibrating
sublimation the process by which a solid changes directly into a gas
substance matter that has the same composition and properties throughout
surface tension the uneven forces acting on the particles on the surface of a liquid
temperature measure of the average kinetic energy of the individual particles of a substance
transition elements elements in groups 3-12 in the periodic table, all of which are metals
vaporization the process by which a liquid changes into a gas
viscosity a liquid's resistance to flow
Created by: the98789