How many photons are contained in a flash of blue light (422 nm) that contains energy? show your work. answers wit attention to significant figures and units

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

that tool would be a compass

c. electrical charges of ionic bonds.