Aseed crystal of diameter d (mm) is placed in a solution of dissolved salt, and new crystal are observed to nucleate (form) at a constant rate r (crystals/min). experiments with seed crystals of different sizes show that the rate of nucleation varies with the seed crystal diameter as: r(crystals/min)= 100-20d a) what are the units of the constants 100 and 20? (assume the given equation is valid and therefore dimensionally homogenous). b) calculate the crystal nucleation rate in crystal/s corresponding to a crystal diameter of 0.050 in. 3 c) derive a formula for r(crystals/s) in terms of d (in).

cock topography

the study of the surface of a large voluptuous cock.

look at that sorostitute right she's a cock topographer!

what classes are you taking this

cock topography!

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

there are two significant figures.