Yes, They can & when they do, they form compounds.
When two or more elements bond together they form a compound.
Covalent bonds usually form between two nonmetals/
Covalent bonds are between nonmetals.
Aluminium will form covalent bonds with other elements if the difference in the electronegativities between the two elements are below 1.7
Ionic Bonds-form when two atoms have a large difference in electronegativity. Covalent Bonds-form when two atoms have a very small difference in electronegativity. Polar Covalent Bonds- form when two elements bond with a moderate difference in electronegativity. Fall between ionic and covalent. Metallic Bonds-form in and between metals
Two atoms of different elements cannot form non-polar covalent bonds.
The question is probably more "Which elements form covalent bonds?" Ionic bonds are between a metal and a non-metal. COVALENT bonds are between two non-metals.
Two elements will form ionic compound if the difference in electronegativity between the two elements is above 1.7 and two elements will form covalent compound if the difference in electronegativity between the two elements is below 1.7 Metals and non-metals will form generally ionic compounds.
carbon and silicone both form the four covalent bonds, nitrogen and phosphorus form three covalent and one coordinate covalent bonds, while sulphur may form two covalent and two coordinate covalent bonds.
There are two kinds of bonding; ionic and covalent. Ionic bonds form between metals and non-metals. Covalent bonds form between non-metals
Ionic compounds do not form between nonmetallic elements. Nonmetallic elements form covalent bonds, and form molecular compounds. Ionic compounds are generally formed by metals and nonmetals.
Only nonmetals can form covalent bonds. Mainly because in a covalent bond the atoms are sharing electrons, as in an ionic bond the two atoms are taking electrons.