Aflask with a volume of 250.0 ml contains air with a density of 1.211 g/l. what is the mass of the air contained in the flask?

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.