Which forces can be classified as intramolecular? london dispersion forces van der waals forces hydrogen bonds covalent bonds

Covalent bonds are the only intramolecular force listed.  All of the other ones are intermolecular forces.  Intramolecular forces only act between the atoms within the molecule while intermolecular forces are the forces that act in between the molecules.

Intermolecular forces: dipole-dipole, London dispersion, ion-dipole, and hydrogen bonding.  (Van der Waal forces I think refer to intermolecular forces in general or it could just refer to London dispersion forces.  I can't completely remember)
intramolecular forces: covalent bonds, ionic bonds, and metallic bonds.  

I hope this helps.  Let me know in the comments if anything is unclear.

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer