Atomic structure

123456789
Across
  1. 4. An atom or a group of atoms with a electrical charge, formed by the loss or gain of electrons
  2. 5. A change that does not result in a new substance being formed. It can be reversed
  3. 6. A vertical column of elements on the periodic table
  4. 7. A change where new substances are formed. This can not easily be reversed
  5. 9. Two or more diffrent elements chemically combined
Down
  1. 1. A substance made from one type of atom
  2. 2. A reaction where a chemical change occurs
  3. 3. Group of atoms bonded together by sharing electrons
  4. 5. A horizontal row of elements on the periodic table
  5. 8. Smallest particle of a chemical element that can exist