GUYS HELP with explanation, time is tickingg
A 10 cm
B 15 cm
C 20 cm
D 40 cm​

Outermost (valence) electrons

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab. 

Ithink that the use of creativity in the sciences entails that one produce something out of nothing or from another thing. with this, i think that the he wrote down his results as four parts of the atomic theory is the manifestation of the  creativity of john dalton.