Matter is made up of anything that has _____ and _____.
The smallest unit of matter that has all the properties of a given element is a(n) _____.
Greek word meaning not to be cut or indivisible.
The one that is NOT matter.
The law of conservation of mass came from his work.
Not one of the three types of models
Discovered negatively charged electrons using a cathode ray tube.
Discovered neutral (meaning “no charge”) neutrons in the nucleus of an atom.
In the _____ model, an atom consisted of a solid ball of positive charge with negatively charged electrons embedded throughout.
Model which states electrons travel in regions of high probability.
Repeating according to some pattern
Found on the left side and middle of the periodic table. Characteristics of metals include: Shiny luster, Good conductors of heat and electricity, malleable
Characteristics include: Dull in appearance, Poor conductors of heat and electricity, Many are gases at room temperature, Brittle—cannot change shape without breaking
Periods on the Periodic Table of the Elements
Approximately __________ elements are naturally occuring.
positively charged particle located in the nucleus of the atom. Its relative atomic mass is 1 amu.
Isotopes
The modern periodic table is arranged by _____.
The dense central portion of the atom.
Combine in groups of three to make up protons and neutrons