Lucy wanted to determine the density of a colorful stone that she had picked up on the beach. Which two properties must Lucy measure in order to calculate the density of the stone. A. Size and shape
B. Mass and volume
C. Mass and temperature
D. Composition and texture

B. Mass and volume

Explanation:

The density of an object is given by its mass per unit is volume. Its mathematical form is given by :

, is a symbol of density of an object

If mass is in g and volume is in cm³, the density is given in g/cm³ and if the mass is in kg and volume is in m³, the density is given in kg/m³.

Hence, two properties must Lucy measure in order to calculate the density of the stone are "mass and volume".

"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."

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