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Periodic Table

7th Grade Physical Science

An arrangement of the elements in order of their atomic numbers such that elements with similar properties fall in the same column, or group. periodic table
A pure substance that is made up of only one type of atom, and cannot be chemically broken down. element
A column of elements is called what? group or family
A row of elements is called what? period
The number of protons in the nucleus of an atom. atomic number
The number of protons and neutrons inside of nucleus. mass number
Letter(s) abbreviation of an element's name. chemical symbol
The names of elements originate (come from) many places including Latin and other scientists. chemical name
An atom is the weighted average of the masses of all naturally occurring isotopes of that element. average atomic mass
One of two or more atoms that have the same number of protons (atomic number) but different numbers of neutrons (atomic mass). isotope
Elements that are shiny, solid, malleable, and conduct heat/electricity very well. metals
Elements that conduct heat/electricity very poorly, and are often dull and brittle. nonmentals
Elements that have some properties of metals and nonmetals. metalloids
The vertical columns (up & down) on the periodic table. group
An electron that is found in the outermost shell of an atom and that determines the atom's chemical properties. valence electron
The horizontal rows (left to right) on the periodic table. period