Is the substance an element or a compound?

Element

Nonmetal

Compound

metal+ nonmetal nonmetals

Molecular Crystals

Polar or Nonpolar Molecules (use Lewis Structure and Shape)

MetalMetallic crystalsmetallic bonds depend on charge of positive ion and # of e1- in the sea of e1-

the greater the charge the stronger the force

Nonpolar Molecular CrystalsVdW forces are weak and get bigger as molecules get bigger

CovalentNetworkCrystalGroup 1Vstrong covalent bondsthe more bonds per atom the stronger the crystal

ionic crystalsionic bonds beween ions of opposite chargedepend on magnitude of charge and distance between ionscloser the ions the stronger the forcehigher the product of charge the stronger the force

CovalentNetworkCrystal

Group III + VSiO2

strong covalent bondsthe more bonds per atom the stronger the crystalSmaller atoms have stronger covalent bonds

Polar Molecular Crystalsdipoles depend on difference in EnH bonds if H and N,O,F

Non-Polar Molecular CrystalsVdW forces depend on size of molecule

Is it a metal or nonmetal?