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Answers
Answer:
because they are noble metals i.e. they don't react to any thing
Answer:
1) pls don't ask for activity ...u know it takes tooooooo long to type.
2) our body is mostly composed of non-metals but some amount of metals too in trace form rest are all are compounds.
but !!!Human being is not an element to be considered metallic or non metallic.
3) gold and platinum as we know are least reactive and hence doesn't react with water and air and hence doesn't rust.
4) sodium as we know is very reactive both in air and water and may even catch fire if comes in contact with these two. Air contains both moisture and O2 . Kerosin is also called a reducing agent in which the amount of water and air is already reduced to nill. hence To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium can't react with kerosene.
5) hydrogen
6) hydrogen
7) hissing sound
hope it helped :)