ionic, covalent, and metallic Bonding ionic, covalent, and metallic

The name’s Bond…Ionic Bond Ionic bonds are formed between ions of opposite charges Formed due to the TRANSFER of electrons Formed between a metal cation and a nonmetal anion Substances held together by ionic bonds are called ionic compounds

The Name’s Bond, Ionic Bond

The Name’s Bond, Ionic Bond Properties of Ionic Compounds Form crystals Hard and brittle VERY high melting points Good conductors when dissolved in water

The name’s Bond, Metallic Bond Formed between atoms of metallic elements Positively charged nuclei held together by a “sea of electrons”

The name’s Bond, Metallic Bond Properties of Metallic bonds Very good conductors Lustrous Very high melting points

The name’s Bond, Metallic Bond Since electrons are free to move around in metallic bonds, metals don’t bond with other metals Instead they form mixtures called Alloys Alloy examples: steel, brass, bronze, and pewter

The name’s Bond, Covalent Bond Formed between nonmetallic atoms Formed due to SHARING of electrons Substances held together by covalent bonds are called molecules

The Name’s Bond, Covalent Bond

The name’s Bond, Covalent Bond Properties of covalent molecules Low melting points Softer and ‘squishier’ then ionic compounds Do not conduct electricity as solids or while dissolved in water.

The name’s Bond, Covalent Bond How evenly the electrons are shared, depends on the electronegativity of the two elements involved Electronegativity: the ability of an atom to attract electrons to itself when bonded to another atom

The name’s Bond, Covalent Bond

The name’s Bond, Covalent Bond When the electronegativity difference between the bonded atoms is small, the electrons are shared evenly the bond is said to be non-polar

The name’s Bond, Covalent Bond When the electronegativity difference between the bonded atoms is great, the electrons are unevenly shared and the bond is said to be polar.

The name’s Bond, Covalent Bond In polar covalent bonds, one atom becomes partially positively charged and one becomes partially negatively charged This is shown using + and -

The name’s Bond, Covalent Bond Practice Label the partial positive and the partial negative side of the polar bonds O-F C-Cl H-F