If a lab requires you to use 1.25 mol oxygen gas in a chemical reaction, how many molecules of oxygen will you need?

How is the shape of the poem “peer” connected to its meaning?

As we move from left to right across the periodic table, what is the general trend? a) atomic radii increase. b) electronegavitiy decreases. c) nuclear shielding increases. d) metallic character decreases.

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!