Chemistry-Periodic Table of Elements vocab Flashcards
period
rows of the periodic table
group,family
columns of the periodic table
reactivity
the ability of a substance to combine chemically with another substance
metal
a class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity
metalloid
an element that has some characteristics of metals and some characteristics of nonmetals
non-metal
elements that are dull in appearance, poor conductor of heat and electricity; a chemical element lacking typical metallic properties
noble gasses
non-metals, group 18, the most non-reactive elements
atomic mass
total mass of the protons and neutrons in an atom
molecule
two or more atoms bonded together
compound
a substance formed by two or more elements
Isotopes
atoms of the same element that have different numbers of neutrons
Ions
electrically charged atoms that have gained or lost electrons.
Radioactive decay
the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
Half-Life
the time required for one half of the atoms of a radioisotope to emit radiation an decay products
Heterogeneous
consisting of elements that are not of the same kind or nature
