That statement may be considered true. 'Specific gravity' is the ratio of the density of a substance to the density of a reference substance. The reference substance is nearly always water, and the ratio of the density of water to the density of water is obviously ' 1'. So there you are.
It's True. Anything that has a density less than 1.0 will float in water. Our human body can float because we have a weight or gravity just less than 1.0.
They have a negative oxidation number because nonmetals gain electrons, thus making them negatively charged ions (anions). Metals become cations and have a positive charge because they lose electrons.
