Apiece of metal weighing 302.5 g is placed in a graduated cylinder containing 207.4ml of water. the volume of water now reads 238.0 ml. from these data calculate the density of the metal

9256.5 g/ml

Explanation:

Use the formula,

Density = mass/volume

;Where you need to calculate the volume change firstly,

Volume = 238.0 - 207.4

;Volume = 30.6 ml

; Hence for calculating density,

; Density = 302.5 × 30.6

; Density = 9256.5 g/ml

"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."