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science chapter 7 set 1
N/A
20
Science
9th Grade
01/12/2011

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Term
Atom
Definition
The smallest piece of any element, a smooth soild sphere without an electrical charge.
Term
Electron
Definition
a negativly charged particle that orbits the nucleus of an atom
Term
Nucleus
Definition
the central part on an atom that contains most of the mass
Term
Protons
Definition
a positively charged particle found in the nucleus of an atom
Term
Subatomic Particles
Definition
one of the parts that make up the atom; includes electrons,protons, and neutrons
Term
Shells
Definition
a specific "allowed" orbit in which electrons circle the nuceuls
Term
Atomic Number
Definition
The average of protons in the nucleus of an atom, used to identify the element
Term
Positive Ion
Definition
An atom that has fewer electrons that has a positive charge
Term
Ion Charge
Definition
The charge of an ion, can be positive or negative
Term
Atomic Mass
Definition
The average mass of all naturally occurring isotops of an electron
Term
neutrons
Definition
A particle found in the nucleus of an atom;it has no charge.
Term
Emission spectrum
Definition
The pattern of light that an element gives off when its atoms absorb electrical or heat energy and re-emit that energy as light; each element will give off a very specific combination of wavelengths,or colours, of light.
Term
Mass Number
Definition
the total number of protons and neutrons in the nucleus of an atom
Term
ion
Definition
a charged atom
Term
Negative ion
Definition
an atom that has more electrons than protons; the ion has a negative charge
Term
Bohr diagram
Definition
a diagram used to help us visualize the arrangement of electrons in an atom
Term
ionic compound
Definition
a compound that forms when a metal atoms react with non metal atoms
Term
electronic transfer
Definition
the process of transferring electrons between metals and non metals to create an ionic bond
Term
ionic bond
Definition
the bond between metal and non metal ions
Term
molecules
Definition
two or more atoms joined together by chemical bonds
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