Calcium can make two bonds because it is in the same group as oxygen.
I make it 36, as well as 6 double bonds and a benzene ring.
4 per carbon is the maximum in most circumstances
Barium can typically form two bonds with other elements. It has two valence electrons that it can share or donate in chemical reactions.
None. helium doesnt react with any other element
Two bonds in total. The oxygen atom forms two covalent bonds, one to each of two hydrogen atoms. This can be represented as H - O - H.
A Ca atom in its 4s^2 electron configuration can make up to 2 bonds without hybridization. This is because it has two unpaired electrons in its 4s orbital available for bonding.
Calcium, Ca, forms ionic bonds. It loses electrons to become the Ca2+ ion
Carbon can make 4 bonds with hydrogen. Nitrogen can make 3 bonds with hydrogen. Oxygen can make 2 bonds with hydrogen.
Selenium can form two bonds with hydrogen.
Calcium can form the ion Ca2+ and forms many ionic compounds. Hybridisation would indicate we were talking about covalent bonding, calcium is not good at this, for example organo-calcium compounds are much more unstable than magnesium.
4
2
Boron can make three bonds without hybridization, as it has three valence electrons to use for bonding.
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I make it 36, as well as 6 double bonds and a benzene ring.