introduction to matter/ atomic structure Flashcards
(19 cards)
matter
anything that has mass and takes up space
pure substance
cannot be broken down physically
mixtures
can be physically seperated
elements
found on the periodic table
compound
two or more types of atoms bonded together
homogeneous mixture
appear uniform throughout solution
heterogeneous mixture
two or more visible components
separation techniques
filtration, by hand, evaporation, chemical reaction, distillation, magnetically, crystallization
physical change
a usually reversible change in the physical property of a substance, such as size or shape
chemical change
a usually irreversible chemical reaction is which a new substance is formed
independent variables
a variable that does not change
dependent variable
a variable that changes
atomic number
number of protons
mass number
protons + neutrons
neutrons
atomic number - mass number
electron configuration
represents an electron’s probable address and where electrons in each atom are located
aufbau exclusion
electrons fill lower energy levels before moving to higher ones
pauli exclusion
opposite spins
hund’s rule
electrons will spread out within a subshell before doubling up
