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Chapter 4 Vocabulary for Physical Science A
Chapter 4 Vocabulary for Physical Science A
11
Science
10th Grade
11/16/2010

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Term
Nucleus
Definition
The dense, positively charged mas located in the center of an atom.
Term
Proton
Definition
A positively charged subatomic particle that is found in the nucleus of an atom.
Term
Electron
Definition
A negitively charged subatomic particle that is found in the space outside the nucleus of an atom.
Term
Atomic Number
Definition
A unique number for each element that equals the number of protons in an atom of that element.
Term
Mass Number
Definition
The sum of the number of protons and neurtrons in the nucleus of an atom.
Term
Isotopes
Definition
Atoms of a given element that have different numbers of neurtrons and different mass numbers.
Term
Energy Levels
Definition
The possible energies that electrons in an atom can have.
Term
Electron Cloud
Definition
A visual model of the most likely locations for the electrons in a atom.
Term
Orbital
Definition
A region of space around the nucleus where an electron is likely to be found.
Term
Electron Configuration
Definition
The arrangement of electrons in the orbitals of an atom.
Term
Ground State
Definition
A state in which all the elcrons in an atom have the lowest possible energies.
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