Un element are pe stratul 3(M)-7 electroni. Stabileste structura înverisului de electronic al atomilor elementului si pozitia acestuia in Tabelul Periodic​

your picture is not part of the scientific method.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg