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Elements
Everything you need to know about elements!
18
Biology
10th Grade
10/03/2009

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Term
Atoms
Definition
-the building blocks of all matter
Term
Nucleus
Definition
-the center of an atom
- the location of neutrons and protons
Term
Protons (p+)
Definition
-positively charged particles
Term
Neutrons (n0)
Definition
-particles that have no charge
Term
Electrons (e-)
Definition
-Negatively charged particles
-Found on the outside of an atom
Term
Element
Definition
-a pure substance that cannot be broken down either physically or chemically
-organized in the Periodic Table of Elements
Term
Isotopes
Definition
-atoms of the same element that have a different number of neutrons
Term
Compound
Definition
-formed when two different elements combine
Term
Covalent Bonds
Definition
-a compound formed when electrons are shared
Term
Molecule
Definition
-a compound in which the atoms are held together by covalent bonds
Term
Ion
Definition
-an atom that has lost or gained one or more electrons
Term
Ionic Bond
Definition
-an electrical attraction between two oppositely charged atoms or groups of atoms called ions
Term
Van der Waals
Definition
-the attractive forces between a positive and a negative region
Term
Chemical Reaction
Definition
-the process of which atoms or groups of atoms are reorganized into different substances
Term
Reactants
Definition
-on the left side of a chemical formula
Term
Products
Definition
-on the right side of the arrow
Term
Activation energy
Definition
the weak interaction between the hydrogen atom and a fluorine, oxygen, or nitrogen atom
Term
Catalyst
Definition
-lowers the amount of activation energy
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