C not sure 100 percent but my best guess
Atomic number of an element is the number of protons present in that element. It is unique for each element. The atomic number of carbon is 6.
Answer:
Th asner you geht whan Ypu mltiply to et
Explanation:
Answer is: reactivity series or activity series.
Reactivity series is an empirical progression of a series of metals, arranged by their reactivity from highest to lowest (alkaline metals have highest reactivity and Noble metals lowest reactivity). This series are used to summarize information about the reactions of metals with acids or water, double displacement reactions (more reactive metals displace metals with lower reactivity) and the extraction of metals from their ores.