14. This simulation uses red dots to represent particles inside an object. As you increase the mass of an object, what
happens to the red dots inside the object and the density of
the object, respectively?
a. The number of red dots decreases, and the density
increases
b. The number of red dots decreases, and the density
decreases
c. The number of red dots doesn't change, but the particles
are more spread out, and the density decreases
d. The number of red dots increases, so the particles become
more closely packed, and the density increases

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

he would use the colour black

it is b that is the answer.