Carbon, with a half-full outer shell of electrons, readily shares its electrons with other atoms and forms a vast number of molecules, many of which are the organic molecules that form the backbone of living matter. looking at the periodic table, which element might play a role like carbon in life forms on some other planet? 1. silicon 2. aluminum 3. oxygen 4. carbon 5. hydrogen

1. silicon

Explanation:

The number of valence electrons in carbon and silicon is 4.  The number of valence electrons in aluminium, oxygen and hydrogen are 3,2 and 1 respectively. Both carbon and silicon belong to group 14 in the periodic table. Both carbon and silicon share similar chemical and physical properties. Both carbon and silicon form four covalent bonds such as in CH₄ and SiH₄.

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