5.0 Ionic Bonding Flashcards
Why do ionic compounds have high melt points?
Strong bonds require lots of energy to break(aka high heat)
What type of formulas are ionic compound formulas?
They are empirical as they are the simplest expression of the ratio in that compound.
Are ionic compounds good conductors?
Not when solid, electrons are trapped in positions and electricity is transferred through flowing electrons. Good when liquid/gas/dissolved in water.
Define Polyatomic Ions
Group of 2 or more atoms that act like one ion.
What kind of structure do solid ionic compounds have?
Crystalline, positive cations attracted to negitive anions
Naming convention of Cations?
Element name +ion
Naming convention of Anions?
Element name + “ide”
Name order in ionic compound?
Cation then Anion
How do you indicate the charge of a transition metal
Roman numeral in brackets after eg Iron (II) vs Iron (III)
Define electronegativity
How strongly atoms attract elecetrons when forming a chemical bond. Least strong bottom left of table, strongest top right.
How do you calculate the electronegativity of a bond
Subtract one elements electronegativity from the other.
What value of electronegativity must a compound be to be considered ionic?
Greater than or equal to 1.8
What value of electronegativity must a compound be to be considered covalent?
Less than 1.8
Define Ionic Bonding
Transfer of electrons between a metal (gives) and non-metal (takes)
Metallic bonding
electrostatic attraction between metal atoms that have released electrons
Covalent Bonding
electrostatic attraction between shared electrons
Why are ionic compounds very polar?
the large differnce in electronegativity of atoms
