Chem Chp. 6

1/2 the distance between the nuclei of 2 atoms of the same element joined together.

An atom or group of atoms with a positive or negative charge.

Ion with a positive charge

Ion with a negative charge

Energy required to remove an electron from an atom

Cations are always smaller than the atoms from which they form. Anions are always larger than the atoms from which they form

The ability of an atom to attract electrons when an atom is in a compound

Electrons in the highest occupied energy level

Metals: Good conductors of heat, malleable

Nonmetals: Poor conductors of heat, Most are gases at room temperature 

Metalloids: Have properties of both metals and nonmetals, Behavior can be controlled by changing conditions

• Group 1A: Alkali Metals 
• Group 2A: Alkaline Earth Metals 
• Group B Elements: Transition Metals 
• Group 7A: Halogens
• Group 8A: Noble gases

• Increases going down by group
• Decreases going right by period

• Decreases going down by the group
• Increases going right by period

• Increases going down by group
• Decreases going right by period

• Decreases going down by group 
• Increases going right by period