Which elements are malleable and good conductors of electricity? (1) iodine and silver
(2) iodine and xenon
(3) tin and silver
(4) tin and xenon

Answer : Option 3) Tin and Silver.

Explanation : The elements which will be malleable (thin sheets) and good conductors of electricity has to be a metal.

i) Iodine and Silver - Iodine is a non-metal and is crystalline in nature so, it cannot be malleable. Although silver is a malleable element and is a good conductor of electricity, but the combination cannot be right. Also iodine is bad conductor of electricity.

ii) Iodine and xenon - Iodine is non malleable and bad conductor of electricity, whereas xenon is a noble gas which cannot be malleable but is a good conductor of electricity.

iii) Tin and Silver- Both are metals in nature and possess the property of being malleable and good conductors of electricity.

iv) Tin and xenon - Tin is although malleable and good conductor of electricity xenon is a gas which is good conductor of electricity but cannot be malleable.

a. a primary source combines several different accounts of an event. b. a primary source generally benefits from having been written after an event.

explanation:

- decrease the number of plants and animals living in the water.