In performing an immunological procedure, you add 2 ml of stock serum to 8
ml of saline. two 1/4 serial dilutions are then made. what is the dilution of
serum contained in the final tube?

answer:

explanation:

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.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements