Hard-soft:hardness; Electron conductor-semiconductor-Physical insulator:conductivity; properties Solid liquidgas:phase or states; Chemical Poisonous-safe:chemical reactivity. alibaba.com.cn crscientito.comHard—soft: hardness; Electron conductor—semiconductor— insulator: conductivity; Physical properties Chemical insulator: conductivity; Solid—liquid—gas: phase or states; Poisonous—safe: chemical reactivity. properties Chemical