関連ワード:  is cobalt a metal or nonmetal    is cobalt a metal nonmetal or semimetal    cobalt is a metallic or nonmetallic    is arsenic a metal or nonmetal    is cobalt a metal nonmetal or metalloid    is cobalt 27 a metal or nonmetal    is cobalt a metal or metalloid    is arsenic a metal nonmetal or semimetal    is arsenic a metal nonmetal or semiconductor    is arsenic a metal nonmetal or metalloids