The distance between sn atoms in tin metal is 2.82 å. (a) what is the atomic radius of a tin atom in this environment

Atomic radius  of  a  metal  is  a  half  of  the  distance  between  the  nuclei  of  two  metal  atoms  in  the  metallic  closed  packed  crystals. Atomic  radius  of tin  atom is    half    of  2.82a  which  is 1.41a , hence atomic radius of tin (Sn) in  tin  metal  is  1.41a

Ch4 is nonpolar and insoluble in water. since all of the hydrogen atoms are evenly spread around the carbon atom even through the c h bond is polar all the poles cancel each other out.

A) the enthralling of formation for pure element in its standard state is always positivehope this : )