Answer: This was because the experiment showed that a substance could emit radiation even while it was not exposed to light.
No of moles = given mass ÷ molecular mass
n = 55.98 ÷ (12+19×2+35.5×2)
So that you can learn while being safe. Wearing goggles, for eye protection when dealing with chemicals
I Believe this is the right answer:
Get a periodic table of elements. ...
Find your element on the periodic table. ...
Locate the element's atomic number. ...
Determine the number of electrons. ...
Look for the atomic mass of the element. ...
Subtract the atomic number from the atomic mass.
Hoped this helped!
