1)Qui a créé la classification périodique des éléments ? En quelle année ?2)Quel est le premier critère utilisé pour classer les éléments chimiques ?

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

In water, a strong acid will break down into its component parts. a. completely b. partly c. never in water, a weak base will break down into its component parts. a. completely b. partly c. never