Chemistry

3. composition the percentage by mass of each element in a compound
4. formula an expression which states the number and type of atoms present in a molecule of a substance.
6. substance produced during a natural, chemical, or manufacturing process
7. compound a chemical compound that contains exactly two different types of elements
10. bond the covalent bonding between atoms in metals
11. electrons one of two or more electrons in the outer shell of an atom
12. reaction a reaction where two or more elements or compounds combine to form a single compound
13. planer structure molecular geometry model with one atom at the center and three atoms at the corners

1. reaction type of chemical reaction where one reactant yields two or more products
2. compound a chemical compound comprising ions held together
5. replacement reaction a type of oxidation-reductionchemical reaction when an element or ion moves out of one compound and into another
8. a substance that takes part in and undergoes change during a reaction
9. formula a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms
11. theory Valence shell electron pair repulsion