2.1 Atoms, Ions, and Molecules

3 Written Questions

1. basic unit of life
2. substance made of only one type of atom that cannot be broken down by chemical means
3. any individual living thing

3 Multiple Choice Questions

1. two or more atoms held together by covalent bonds; not necessarily a compound
   1. molecule
   2. compound
   3. cell
   4. element
2. chemical bond formed through the electrical force between oppositely charged ions
   1. covalent bond
   2. ion
   3. compound
   4. ionic bond
3. atom that has gained or lost one or more electrons
   1. atom
   2. ion
   3. element
   4. cell

3 True/False Questions

1. covalent bond → chemical bond formed through the electrical force between oppositely charged ions

   True        False

2. compound → substance made of atoms of different elements that are bonded together in a particular ratio

   True        False

3. atom → smallest basic unit of matter

   True        False