chem Flashcards
what are alkali metals
very reactive metals in group 1 of the periodic table
what are alkali earth metals
reactive metals in group 2 of the periodic table
define halogen
non metal element in the periodic table
define noble gases
elements in the last column of the periodic table
define catalyst
chemicals that speed up reactions
define annylase
enzyme in saliva breaks down starch
define catalase
enzyme in liver involved in breakdown of hydrogen
define atom
very small particles that make up all things. atoms have the same properties as the objects they make up
determine how to find neutrons
mass number - atomic number
how to find protons
atomic number (top number)
how to find electrons
for uncharged atoms - same as protons
for charged atoms - if negative ion odd and if cation subtract change
define ions
atoms or groups of atoms that have lost or gained electrons
define cations
atoms or groups of atoms that have lost electrons and are positively charged
define anions
atoms or groups of atoms that have lost electrons and are negatively charged
define ionic compounds
compounds containing both positive and negative ions held together by the electrostatic force. formed when metals and non metals combine
