S2.1 Ionic Flashcards
what is isoelectronic?
two different species with the same electron configuration eg Mg2+ and Ne
what is electronegativity?
the ability of an atom to attract a pair of covalently bonded electrons
what is a lattice?
continuous 3d networks of repeating units of positive and negative ions
what is lattice enthalpy?
how strong the ionic bonds are in particular ionic lattice
ammonium ion
NH4+
nitrate ion
NO3-
hydrogencarbonate
HCO3-
why are ionic compounds usually brittle?
bc when a force is applied, the force displaces some ions within the lattice which means ions of the same charge are positioned next to each other. The repulsive forces between the ions cause the lattice to split
what are the 2 factors affecting lattice enthalpy?
ionic radius and ionic charge
the strength of the electrostatic attraction between oppositely charged ions
increases w increasing ionic charge; decreases w increasing ionic radius
what is volatility?
the tendency of a substance to vaporize
ionic compounds: volatility
volatility is low because for ionic compounds to turn into gases, the strong electrostatic forces of attraction holding the ions together need to be overcome
what are ionic compounds soluble and insoluble in?
soluble in polar solvents(water); insoluble in non-polar solvents(hexane)
carbonate ion
CO3 2-
sulfate ion
SO4 2-
