Science Test 2/3/09

14 terms by wadrkhadija 

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Matter

any substance that takes up space and has mass

Molecules

smallest part of a compound

Compound

made up of two or more elements

Rows

How many electron shells

Columns

How many valence electrons are in the last valence shell

Atomic #

# of protons

Atomic Mass

# of protons + # of neutrons

# of Neutrons

# of protons - atomic mass

Inert

Having no inherent power of action, motion, or resistance

Isotope

Variation in an atom of an element with different # of neutrons

Ions

When an atom or molecule loses or gains an electron so that it becomes a charged particle

Ionic Bond

Attraction of opposite charged ions

Covalent Bond

Atoms sharing electrons

Polar Bond

Between opposite poles of polar molecules

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