What does "active metal" mean?
First of all, it is necessary to define the liveliness of metals and the liveliness of metals, that is, the degree of liveliness of metals in chemical reactions. In the periodic table, the stronger the metal, the stronger the lower left, the weaker the upper right.
Second, understand the lively nature of metals:1. the intensity of the reaction with oxygen.2. the intensity of the reaction with the acid.3. is the metal able to displace other metals from the solution of their compounds?.4. whether it can displace hydrochloric acid, hydrogen in dilute sulfuric acid.The more active metals themselves tend to lose electrons and undergo oxidation reactions, and their potential is lower.
Determination of metal is lively and can replace metal hydride in hydrogen, the hydrogen by replacement reaction to elemental hydrogen, if the hydrogen in metal hydride elements that determine the first replacement out of the metal active, then can react with metal hydride to determine the strength of the order of the number of active metal
