David observed properties of four different compounds, only
one of which is an ionic compound. His observations are
shown in the chart.
Compound
W
Observations
Is a hard solid, melts
at 44° C, has a
molecular structure
Is a brittle solid, does
not conduct
electricity in water.
has a crystal
structure
Is a hard solid
conducts electricity.
has a molecular
structure
Is a brittle solid,

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

What is the molarity of the solution produced when 145 g of nacl is dissolved in sufficient water to prepare 2.75 l of solution?