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Name: Class #: Chemistry Unit Notes PROPERTIES OF MATTER Matter = Anything that has ________________and takes up _______________. Even if you can’t see it or hold it (like air). Atom = A small ______________________that makes up matter. Named by Democritus, a Greek philosopher. Atoms have many parts: Electrons = Invisible, ______________________charged particles. Nucleus = Positively charged _________________________of an atom Protons = _______________________ charged particles in the nucleus Neutrons = _____________________ particles in the nucleus Niels Bohr = Designed the atomic ___________________ that we use today. ELEMENTS Element = Matter made of only _______________ kind of atom. Ex. Oxygen Can be naturally made or man-made. Symbol = contains ______________ letters. Used to save time and space Atomic Number = the number of _____________________in the nucleus of each atom. Ex. Oxygen = 8 Isotope = atoms of the same element but have different number of neutrons Atomic Mass = Weighted ___________________ of the isotopes Periodic Table of Elements Periodic Table = Used to __________________, ____________________, and display elements. It is organized into rows and columns by properties and relationships. Metals = __________________ or metallic. Good ______________________of heat and electricity. Mostly solid at room temperature. Malleable (bendable) Non-Metals = ____________________ in appearance. __________________ conductors of heat and electricity. Mostly gases at room temperature. Brittle Metalloids = Have characteristics of ________________& _________________. Mostly solid at room temperature. Fairly good conductors. COMPOUNDS & MIXTURES Compound = More than one element ____________________together. Examples: Compound Formula = Tells you what elements make up a compound. Examples: Mixture = _____________________ compounds mixed together. Not bonded. Examples: Homogenous = the ________________throughout. You cannot see a difference Examples: Heterogeneous = Visible _____________________parts Examples:
