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BIO 120 Chapter 2
Flash Cards
Term | Definition |
---|---|
Element- | matter that cannot be broken down to other substances by chemical reactions, has mass, and occupies space |
Proton- | located in the core of an atom, positive charge, weighs 1 amu |
Electron- | located outside the nucleus of an atom, negative charge, weighs about 0 amu |
Neutron- | located in core of an atom, no charge, weighs 1 amu |
Atom- | smallest unit of an element |
Subatomic particles- | what atoms are made of |
Isotope- | the number of protons are not equal to the number of neutrons in an atom |
Valence electrons- | electrons on the outermost shell of an atom |
Cation- | positively charged atom |
Anion- | negatively charged atom |
Ionic Bond- | bond between two atoms where there is a transfer of electrons, very strong |
Covalent Bond- | bond between atoms where they share electrons, very strong |
Polar Covalent Bond- | bond between atoms where the electrons are not shared equally, causing partial charges on the molecule |
Hydrogen Bond- | weak, short-lived interactions between partially charged parts of molecules |
Van Der Walls Interactions- | interactions between non-polar covalent molecules, weak and short-lived |
Chemical reactions- | the making and breaking of chemical bonds |