Asample of metal has a mass of 34.65 g. when placed in a graduated cylinder containing 20 ml of water, the water level rises to 23.3 ml. which of the following metals is the sample made from: silver, which has a density of 10.5 g/cm3; tin, which has a density of 7.28 g/cm3; or titanium, which has a density of 4.5 g/cm3?

- The sample is made from silver, which has a density of .

Solution:- Mass of the metal is 34.65 gram. Volume of water in the graduated cylinder is 20 mL. When the metal is placed in the cylinder filled with water, the water level rises to 23.3 mL.

So, the volume of the metal = 23.3 mL - 20mL = 3.3 mL

Now, we have the mass and volume of the metal, so it's density could easily be calculated by using the density formula:

since,

So, density =

Hence, the sample is made from silver, which has a density of .

"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."