an atom or group of atoms that has a positive or negative electric charge because it has lost or gained electrons
in most chemical reactions, atoms tend to match the outer electron configuration of the noble gases. This is called the ______ ______
-arranged in crystal lattice structure
-shaped in a cube formation
-anions and cations are ionically bonded
-arranged in octahedral position
describe the structure of salt crystals
because of the interaction with opposite charges. also, ionic solids melt when heated to form liquids, making this a poor conductor of heat
why are ionic solids generally poor conductors of electricity?
when melted or dissolved because they are no longer tightly held in the formation, making it easy for the salt to move freely in order to conduct electricity
when are salts excellent conductors of heat?
the ionic compounds causes the compounds to be hard because the structure is tightly held together in the crystal lattice structure
describe why the structure of ionic compounds causes the compounds to be hard
-number of electrons
an ion and its parent ion atom differ in:
the arrangement of ion in sodium chloride shows that each ion is surrounded by ____ oppositely-charged ions.
the attractive force between sodium ions and chloride ions results in an arrangement of ions in repeating units arranged to form a ___________
in the sodium chloride crystal arrangement, the net effect is that the _______ between oppositely charged ions is significantly greater than _________ between ions of like charge.
the arrangement of cations and anions depends on the ______ and the ______ of the ions.
metals need to lose electrons in order to reach the noble gas configuration, which forms cations.
why do atoms of metals form cations?
nonmetals need to gain electrons in order to reach the noble gas configuration, which forms anions.
why do atoms of nonmetals form anions?
1. high melting/ boiling point
2. soluble in water
3. conduct electricity when dissolved in water
4. crystalline solids
5. brittle and break under stress
name five characteristics of ionic compounds:
they have a strong electrostatic attraction to each other, causing them to have high melting/ boiling points.
why do ionic compounds have high melting points and high boiling points?
each group's ionic charges are equal to lost or gained valence electrons to form an ion
what is shown about all of the ionic charges for groups 1, 2, 15, 16, and 17?
-more than 4 valence electrons
-conducts electricity in solid state
-only forms positive ions
-gives away electrons in chemical reactions
properties of metals: