Half life is the time taken for a radioactive isotope to decay by half its original mass. In this case the half life of carbon-14 is 5.730 years.
Using the formula;
New mass = original mass × (1/2)^n; where n is the number of half lives (in this case n=1 )
New mass = 2 g × (1/2)^1
= 1 g
Therefore; the mass of carbon-14 that remains will be 1 g
Magnesium will give two electrons to oxygen and both will become ions.
Iodine is going to form anions capturing electrons from some other element more electropositive
It contains 23000/13= 1769.23 C¹³ atoms
