Rank the metals from most reactive (1) to least reactive (3) tantalum: niobium dubnium

If a || b and e || f, what is the value of y ?

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

What does the xylem do? stores the glucose captures the sunlight absorbs oxygen into the leaf carries water from the roots to the leaves