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Periodic Table Vocab
Title says it
17
Science
8th Grade
02/09/2012

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Term
Atom
Definition
The basic particle from which every element is made.
Term
Electron
Definition
A negatively charged particle found outside the nucleus of an atom.
Term
Nucleus
Definition
The central core of an atom
Term
Proton
Definition
A positively charged particle that is part of an atom’s nucleus.
Term
Energy Level
Definition
The specific amount of energy an electron has.
Term
Neutron
Definition
- A small particle in the neutron of an atom, that has no electrical charge.
Term
Atomic Number
Definition
- the number of protons in the nucleus of an atom.
Term
Isotope
Definition
An atom with the same amount of protons but different amount of neutrons from other atoms in the same element.
Term
Mass number
Definition
The sum of protons and neutrons in the nucleus of an atom.
Term
Atomic Mass
Definition
The average mass of all the isotopes of an element.
Term
Periodic Table
Definition
A chart of elements showing the repeating pattern of their properties.
Term
Period
Definition
A horizontal row of elements in the periodic table.
Term
Group (family)
Definition
Elements in the same vertical column of the periodic table; also called a family.
Term
Chemical Symbol
Definition
A one or two-letter representation of an element.
Term
Plasma
Definition
A gas like state of matter consisting of a mixture of free electrons and atoms that are stripped of their electrons.
Term
Nuclear fusion
Definition
A nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.
Term
Nuclear fission
Definition
A nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy
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