Define heavy water, point out the one advantage of hard water.

Hard water is water that has high mineral content

Drinking hard water is generally safe. In fact, it may actually be beneficial towards your health. The benefits of hard water include fulfilling your dietary needs of essential minerals, such as calcium and magnesium.

"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."