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
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Helium is a noble gas and is therefore chemically stable, so it typically does not form bonds with other atoms. Helium's electronic configuration with 2 electrons in its 1s orbital does not allow it to form bonds by sharing electrons with other atoms.
A carbon atom needs four electrons to have a full outer shell so I guess it can form a maximum of four bonds.
Nitrogen can form a maximum of three single covalent bonds, one with each of its three 2p electrons.
None. helium doesnt react with any other element
maximum of five single covalent bonds as in PCl5
Nitrogen can form three covalent bonds when it has no negative charge.
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.
Carbon can form four covalent bonds at most, such as in methane.
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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.
Carbon form generally covalent bonds; ionic bonds are rare.
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The number of covalent bonds an atom can form is determined by the number of valence electrons it has. Atoms will typically form covalent bonds by sharing electrons to achieve a full outer electron shell, following the octet rule (except for hydrogen and helium, which follow the duet rule). An atom can form as many covalent bonds as needed to fill its valence shell.
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