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.

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation: