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shafter

Mrs. Shafter's Atomic Structure and the Periodic Table

QuestionAnswer
A positively charged particle located in an atom's nucleus. proton
A particle that has no electric charge and is located in an atom's nucleus. neutron
The central region of an atom where most of the atom's mass is found in protons and neutrons. nucleus
A negatively charged particle locate outside an atom's nucleus. electron
The number of protons in the nucleus of an atom. atomic number
The total number of protons and neutrons in an atom's nucleus. atomic mass number
An atom of one element that has a differnt number of neutrons than another atom of the same element. isotope
An atom or group of atoms that has a positive or negative electric charge. ion
The average mass of the atoms of an element. atomic mass
A table of the elements, arranged by the atomic number, that shows the pattern in their properties. periodic table
A vertical column in the periodic table of the elements. Elements in the group have similar properties. group
A horizontal row in the periodic table of the elements. Elements in the period have varying properties. period
Likely to undergo chemical change. reactive
An element that tends to be shiny, easily shaped, and a good conductor of electricity and heat. metal
An element that is not a metal and has properties generally opposite to a metal. nonmetal
An element that has properties of both metals and nonmetals. metalloid
The process by which the nucleus of an atom of an element releases energy and particles. radioactivity
The amount of time it takes for half the nuclei of a radioactive isotope to decay into atoms of another element. half-life
Created by: shaftela
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