En que coinciden las fuentes a y b sobre la percepcion de la poblacion respecto de los principales problemas que percibe la ciudadania?¿Ha variado en el tiempo

Which element is the least metallic between cadmium, silver, zinc, or iron?

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal. b. he is determining chemical properties that are sufficient to identify the metal. c. he is determining physical properties that are insufficient to identify the metal. d. he is determining chemical properties that are insufficient to identify the metal.

Answer explain why it is not possible to deduce a complete order of reactivity.