On the periodic table, why is the mass number expressed as a decimal? * A-All atoms have half of a proton or half of a neutron in the nucleus, so decimals are necessary
B-Scientists are obsessed with small facts, so they measure atoms masses with tiny scales to get it just right
C-Elements can exist in nature with different numbers of neutrons, so the mass is an average of the isotopes that exist
D-Electrons have a very small mass, so they add decimal points to the mass of an atom.

What are the genotypic and phenotypic ratios

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices