What is a shiny metal, in period 5, and has 3 valence electrons. What is that element's name? 69 POINTS

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity