atomic number Flashcards
average mass of a element is the average mass of the mixture of isotopes
average atomic mass
shorthand way to write the name of an element
chemical symbol
a diagram to represent electrons in the outer energy level of an atom
dot diagram
negatively charged particles that move around the nucleus of an atom
electron
region where electrons most probably are found surrounding the nucleus of an atom
electron cloud
in the periodic table, each of the 18 vertical columns of elements (similar properties)
groups
atoms of the Same element that have different numbers of neutrons
isotope
sum of the number of protons and neutrons in an atoms nucleus
mass number
elements usually having these common properties; shiny, good conductors of heat and electricity, solid at room temperature
metal
elements having properties of both metals and nonmetals
metalloid
atom particle with no charge that is part of an atoms nucleus
neutron
elements that are usually gases or brittle solids at room temperature, don’t conduct heat or electricity well
nonmetal
positively charged center of an atom that contains protons and neutrons
nucleus
horizontal row in the periodic table
period
table of elements arranged according to repeated changes in properties
periodic table
atomic particle with a positive charge that is part of an atoms nucleus
proton
very small particles of matter that make up protons and neutrons, 6 known
quark
number of protons in an atoms nucleus
atomic number
