vocab Flashcards
group
columns of elements (up and down)
perodic table
elements arranged according to similar properties
representative elements
the group A elements
metals
good conductors of heat and electricity, shiny, ductile (wires), malleable (thin sheets), high melting point and density
non-metals
not good conductors of heat and electricity, not shiny, not ductile, not malleable, low melting point and density
transition elements
group B elements (very common)
metalloids
elements on the zig-zag line that have properties of metals and non-metals (ex. Boron is shiny but not a conductor)
ions
a positively or negatively charged atom
cation
positive, metals, lose electrons
anions
negative, non-metals, gains electrons
molecule
electrically neutral group of atoms
molecule compound
composed of molecules, electrically neutral, made of 2 or more non-metals, low melting point and boiling point, gas/liquid at room temperature, non-conductor (exception is hydrogen)
ionic compounds
metal and non-metal, cation/anion, high melting point and boiling point, solid at room temperature, is a conductor
chemical formula
show the kinds and number of atoms and elements in a reaction
formula unit
the chemical formula for an ionic compound
law of definite proportions
in any chemical compound the masses of the elements are always in proportion
law of multiple proportions
the same 2 elements may form more than 1 compound
polyatomic ions
a group of particles with a charge
binary compounds
compound that contains 2 elements
ternary compounds
compound that contains 3 or more elements
