The smallest particle into which an element can be divided and still be the same substance
The negatively charged particles found in all atoms
The tiny, extremely dense, positively charged region in the center of an atom
the regions inside an atom where electrons are likely to be found
The positively charged particles of the nucleus
The particles of the nucleus that have no charge
The number of protons in the nucleus of an atom.
Protons and Electrons
A neutral atom has an equal number of ________ and ________.
The horizontal rows of elements in the periodic table
Groups or Family
Vertical columns on periodic table
A unifying explanation for a broad range of hypotheses and observations that have been supported by testing
A representation of an object or system
Atoms that have the same number of protons but have different numbers of neutrons
Mass number, Atomic Mass Unit ,AMU or Atomic Weight
The sum of the protons and neutrons in an atom
PERIODIC TABLE OF ELEMENTS
A CHART THAT ORGANIZES ALL KNOWN ELEMENTS INTO A GRID OF HORIZONTAL ROWS (PERIODS) AND VERTICAL COLUMNS (GROUPS OR FAMILIES) ARRANGED BY INCREASING ATOMIC NUMBER
A pure substance that is made up of only one kind of atom
Created the first periodic table, arranged elements by increasing atomic mass
The study of matter and the changes that it undergoes
Particles found within the atom, mainly protons, neutrons, and electrons.
A one or two letter representation of an element