1. Which structural feature is found in most unsaturated hydrocarbons and never in a saturated hydrocarbon? O a branched carbon chain a single covalent bond O bonds between carbon and hydrogen atoms O a double or triple covalent bond​

Saturated hydrocarbons can form only single covalent bond while unsaturated hydrocarbons can form double or triple bond

Therefore A double or triple covalent bond

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radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

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