radioisotope cobalt 60, half life 5.3 years has activity of 12,400 cmp how much time has passed if the activity of the sample has dropped to 775 cpm

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.

Show and image of the mixtures or write them

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.