Answers

2014-05-03T11:59:09+05:30
There are 118 types of elements that are known and its in system. 109 of these elements are said to be unstable. 
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2014-05-03T12:02:22+05:30
There are 118 types of element that are known to all.109 of these elements are said to be unstable and they r only made in tiny quantities.
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