Covalent network solids typically have blank melting points and blank boiling points

Covalent network solids typically have high melting points and high boiling points

Explanation:

Covalent solids are the solids which have covalent bonds as intermolecular or interatomic interactions.

As covalent bonds are very strong, these solids are generally characterized by high melting points and high boiling points.

The examples of such solids are: Diamond and Graphite.

The other classes of solids are

i) ionic

ii) molecular

iii) metallic.

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

what's the