Such as alkali metals, these aspects are found in compounds rather then pure sort. Alkaline earths are reactive but fewer so than alkali metals. Team IIA metals are hard and shiny and typically malleable and ductile. Praseodymium is used in petroleum catalytic cracking. The addition of praseodymium and neodymium enrichment https://sethcwnc21986.mysticwiki.com/779846/duramax_garage_power_performance_and_precision