None, just like Neon. However, I've heard that Helium can bond briefly sometimes, but artificially induced in a lab under great pressure, etc. This isn't officially proved yet.
None. helium doesnt react with any other element
2
Helium does not form any bonds unless it is ionized using a tremendous energy. And it undergoes nuclear reactions when there is a high temperature such as the sun's surface.
A carbon atom needs four electrons to have a full outer shell so I guess it can form a maximum of four bonds.
Carbon atoms do not gain electrons to form a covalent bond. Carbon atoms form four covalent bonds by sharing its four valence electrons with the valence electrons of other atoms. These can be single bonds, in which one pair of electrons is shared; double bonds, in which two pairs of electrons are shared; or triple bonds, in which three electrons are shared; or a combination of these.
2 covalent bonds
None. helium doesnt react with any other element
maximum of five single covalent bonds as in PCl5
Maximum of four bonds. It can form four
Carbon will form four covalent bonds, nitrogen will form three covalent bonds, oxygen will form two covalent bonds, and hydrogen will form one covalent bond. Click on the related link to see a diagram showing the structure of an amino acid.
4
Single, double, and triple covalent bonds
A carbon atom can form 4 single covalent bonds
The nitrogen atom forms 3 covalent bonds.
Boron will form the covalent bonds based on the octet rule.
Carbon form generally covalent bonds; ionic bonds are rare.
Sulfur can form two covalent bonds as in H2S, and can form 6 as in SO3. In elemnatl allotropes of sulfur which are covalent bonded, many are cyclic compounds the number of covalent onds is 2.