The answers you seek come in the form of a periodic table. Here's a good one http://www.webelements.com/biolo... The tactile strength of an element is all determined by the apparent density and mass of the metal being measured. So you would have to be way more specific. read more
The weakest metal is said to be the least reactive. The Reactivity Series is a list of metallic elements, with the strongest metals at the top and the weakest at the bottom. Potassium is the strongest and gold is the weakest. read more