Electrons, specifically valence electrons are shared when elements form bonds.
I think you mean IONS. Elements that form IONS by losing or gaining electrons, form IONIC bonds. These form when a metal reacts with a non-metal.
Reactive elements have atoms that can combine to form compounds. The atoms in a compound are combined through different types of bonds, such as ionic, covalent, hydrogen, and metallic bonding. With ionic bonding, there is an exchange of electrons between atoms. Covalent bonding occurs when electrons are shared by two atoms.
Electrons are shared when elements combine to form molecules.
Group-14 elements share electrons. they form covalent bonds.
Why does group 4A elements tend to form covalent bonds rather than ionic bonds? 
Elements form bonds because of the attractions between atoms or ions. There are several types of bonds such as ionic, covalent and metallic bonds.
covalent bonds are formed when electrons are shared between atoms.
a compound
Rule of thumb answer is covalent bonds form between non metal elements.
they form elements
they form compounds
Electrons are shared when elements combine to form molecules. These are subatomic particles with a negative elementary electric charge.