The answer is 1 polonium and radium
A bond is formed when electrons are shared between atoms.
<h3>What is the number of unshared pairs?</h3>
A bond is formed when electrons are shared between atoms. This is what we call a shared pair. A lone pair or unshared pair is one that is domiciled on only one of the atoms in the bond.
Let us now look at the molecule shown in image 1;
- The number of unshared pairs in atom a is 0
- The number of unshared pairs in atom b is 2
- The number of unshared pairs in atom c is 0
Let us now look at the molecule shown in image 2;
- The number of unshared pairs in atom a is 1
- The number of unshared pairs in atom b is 2
- The number of unshared pairs in atom c is 3
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All of the atoms of a saturated hydrocarbon are bonded by 4 pairs of electrons in case of a carbon and 1 pair in case of hydrogen.
Saturated hydrocarbons are hydrocarbons with only single bonds. Each carbon has a maximum number of hydrogen atoms bonded to it. A good example is alkanes. On the other hand the unsaturated hyrocarbon are hydrocarbons with at least one double bond or triple bond.
