The half-life of Radium-226 is 1590 years. If a sample contains 300 mg, how many mg will remain after 1000 years

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

jjj89t'ji; it hink the answer is your mom is not si

i do not get it   at all

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)