mixtures and compounds

what is the mass number of an element (top left)

the weight

what is the atomic number of an element (bottom left)

the proton and electron count

how do you get the number of neutrons?

mass minus atomic number

what charge do protons have

positive

what charge do electrons have

negative

what charge do neutrons have

neutral

isotope

versions of the same element that are heavier and have a difference in atomic weght

atom

building block of matter

element

a substance that is composed of only one type of atom

compound

a substance that is composed of two or more different atoms

pure substance

all one element or all one compound

mixture

a combination of two or more substances that are not chemically combined

heterogeneous mixture

a mixture in which different materials can be distinguished easily; composition is not uniform

homogeneous mixture

a mixture in which substances are evenly distributed throughout the mixture; composition is uniform

when a diagram shows different types of compounds (not the same elements), it's a _______

mixture

when a diagram shows a bunch of single atoms, it's showing particles in _______

element