chemistry

Na is a metal
O, Si, Kr, B are nonmetals
Mn is a semimetal

why am i getting this wrong ?

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asked by natash
  1. O is written incorrectly, it should be O2. However, I doubt if that is the problem. Si and B is often classified as a metalloid (Some call this semimetal). Mn is a metal

    http://en.wikipedia.org/wiki/Metalloid

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