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Chapter 4-6
Science Terms
31
Science
6th Grade
11/05/2008

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Term
Atom
Definition
The smallest unit of an element that maintains the properties of that element.
Term
Electron
Definition
A subatomic particle that has a negative charge.
Term
Nucleus
Definition
An atom’s central region. It is made up a protons and neutrons. It is positively charged.
Term
Electron Cloud
Definition
A region inside an atom where electrons are likely to be found
Term
Protons
Definition
Positively charged particles in the nucleus.
Term
Atomic Mass Unit
Definition
A unit of mass that describes the mass of an atom or molecule
Term
Neutron
Definition
Particles of the nucleus that have no electrical charge
Term
Atomic Number
Definition
The number of protons in the nucleus of an atom.
Term
Isotopes
Definition
Atoms that have the same number of protons but have different numbers of neutrons.
Term
Mass number
Definition
The sum of protons and neutrons in an atom.
Term
Atomic Mass
Definition
The mass of an atom expressed in atomic mass units
Term
4 Basic Forces
Definition
Gravitational Force, Electromagnetic Force, Strong Force, and weak force
Term
Chapter 5
Definition
Term
Periodic
Definition
Means happens at regular intervals
Term
Periodic Law
Definition
The law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of elements.
Term
4 Properties of Metals
Definition
Tend to be shiny, good electricity conductors, malleable, good thermal energy conductors
Term
Period
Definition
In chemistry it is a horizontal row of elements on the periodic table. It is also called a family.
Term
Alkali Metal
Definition
All element in Group 1 of the periodic table.
Term
Group
Definition
In chemistry it is a vertical row of elements on the periodic table.
Term
Alkaline-Earth Metals
Definition
1 of the elements of Group 2 of the periodic table.
Term
Group 1
Definition
Alkali Metals. Most reactive because they can easily give away its 1 outer level electron. Includes Sodium and Potassium
Term
Group 2
Definition
Alkaline Earth Metals. Less reactive than Alkali. Include Magnesium and Calcium.
Term
Group 3-12
Definition
Transition Metals: Do not give away their electrons as easily Group 1 and Group 2. Less reactive than Groups 1 & 2
Term
Lanthanides
Definition
Row 1 Shiny, reactive metals
Term
Actinides
Definition
Row 2, radioactive or unstable.
Term
Group 13
Definition
Boron Group
Term
Group 14
Definition
Carbon Group
Term
Group 15
Definition
Nitrogen Group
Term
Group 16
Definition
Oxygen Group
Term
Group 17
Definition
Halogen Group
Term
Noble Gas
Definition
Nonreactive nonmetals. Group 18
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