Final Revision Science

An atom or group of atoms that has either a positive or negative charge

• Ions

• Polyatomic ion

• A Molecule

An ion made of more than one atom (ex. The ammonium ion is made of one nitrogen atoms and four hydrogen atoms NH4 +1)

• Ions

• Polyatomic ion

• A Molecule

A neutral group of atoms joined by covalent bonds

• Ions

• Polyatomic ion

• A Molecule

The force of attraction that holds atoms together

• Chemical bond

• Polyatomic ion

The charge of an ion that has gained electrons is:

• Positive

• Negative

The charge of an ion that has lost electrons is:

• Positive

• Negative

The purpose of ions in chemical reactions is to stabilize the overall charge of a molecule

• True

• False

When atoms that easily lose electrons react with atoms that easily gain electrons, they transfer valence electrons to form (Transfer valence electrons )

• Ionic bond

• Covalent Bond

A type of chemical bond that forms when two atoms share one or more pairs of electrons in order to achieve a more stable electron configuration (Share one or more pairs of electrons)

• Ionic bond

• Covalent Bond

d forms when a metal combines with a nonmetal

• Ionic bond

• Covalent Bond