Week 7 Properties of Matter

1) Atomic Number The number of protons in the nucleus of an atom.  Also the number that places them in order on the periodic table. 

2) Atomic Mass

The sum of the protons and neutrons in the nucleus of each atom.  (similar to weight) 

3) Energy Levels

The possible locations around an atom where electrons having specific energy values may be found. The more energy they have the farther from the nucleus they will be. 

4)  Characteristic/Property 

A quality of a substance that never changes and can be used to identify the substance
5) Chemical Symbol A one or two letter code that stands or the name of an element.
6) Solid Matter that has a definite shape and volume, such as a rock.  
7) Liquid Matter that can flow and change its shape.  When poured into a container, it takes the shape of the container, but its volume stays the same. (definite volume, no definite shape)
8) Gas  Matter with no special shape or size.  It takes up the size and shape of any container that holds it.  (No definite volume, no definite shape) 
9) Ion  an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

10) Isotope 

Atoms of the same element with different numbers of neutrons in the nucleus, thus different atomic masses.  ( ex: Carbon-12 and Carbon -14)  


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