Solid yttrium metal does not react with oxygen in the air. However, it reacts very rapidly when in its powdered form. Yttrium powder may react explosively with oxygen at high temperatures.

1: Covalent and Ionic Bonding. (a) In molecular hydrogen (H2), two hydrogen atoms share two electrons to form a covalent bond….2.11: Ions and Ionic Bonds.

List of yttrium compounds

In order to form an ionic bond with oxygen, the other element has to be a metal. Hydrogen, chlorine, and nitrogen are non-metals so these can form covalent bonds with oxygen. But calcium is a metal and it forms ionic bonds with oxygen.

Ionic bonds usually occur between metal and nonmetal ions. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom. In general, ionic bonds occur between elements that are far apart on the periodic table.

An oxygen molecule (O2) is a good example of a molecule with a covalent bond. Ionic bonds occur when electrons are donated from one atom to another. Table salt (NaCl) is a common example of a compound with an ionic bond.

Generally, London dispersion forces depend on the atomic or molecular weight of the material. Heavier atoms or molecules have more electrons, and stronger London forces. This means that they are harder to melt or boil.

Propane

The state of matter depends on: – temperature – pressure – The kinetic energy of the particles. – The strength of the attractions between the particles. Molecules/atoms can stick to each other.