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Chemistry
Chemistry
19
Science
7th Grade
03/06/2012

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Cards

Term
Atom
Definition
Smallest Particle of an element
Term
Element
Definition
A pure substance that contains only one kind of atom
Term
Proton
Definition
A positive particle found in the nucleus of an atom.
Term
Neutron
Definition
A particle found in the nucleus of an atom that has no charge.
Term
Electron
Definition
The negatively charged particle found in an atom
Term
Nucleus
Definition

The small, dense, central core of an tom.

 

Term
Enegry Levels
Definition
Orbits found outside the nucleus of an atom in which electrons travel.
Term
Atomic mass unit
Definition
The mass of a single proton or neutron; amu.
Term
Atomic number
Definition
The number of protons in the nucleus of an atom.
Term
Mass number
Definition
The total number of protons and neutrons in the nucleus of an atom; it is found by rounding off the atomic mass to the nearest whole number.
Term
Atomic mass
Definition
The sum of the relative masses of the protons and neutrons in an atom.
Term
Isotopes
Definition
Atoms of the same element that have a different number of neutrons.
Term
Ion
Definition
An atom or group of atoms that have an electric charge as the result of losing or gaining electrons.
Term
Periodic Table
Definition
The organization of the element similar elements are grouped in horizontal rows (periods) and vertical columns (groups).
Term
Period
Definition
A horizontal (<----->) Row of elements in the periodic table; 7 rows = 7 periods.
Term
Groups
Definition
Sets of elements arranged in vertical columns in the periodic table: 18 groups: groups are often called families.
Term
Metal
Definition
Elements that tend to LOSE electrons easily; they are located on the left of the staircase on the periodic table.
Term
Nonmetals
Definition
Elements that tend to GAIN electrons easily; they are located on the right of the staircase on the periodic table.
Term
Metalloids
Definition
Substances that exhibit some, but not all, of the properties of metals.
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