Intro to Chem 1500 Ch. 2


homogeneous pure substance composed of atoms with the same number of protons

using a symbol

a shortcut method of defining and element

H, N, O, F, Cl, Br, I

What are the diatomic molecules?


the basic building block of matter, smallest unit that can't be broken down


an element with different number of neutrons

6.02 x 10^23

what is one mol equal to?

the atomic mass

if you are asked what one mol of something is, what would the answer be knowing its atomic mass?