1) The half-life of Actinium-225 is 10days. If you began with a 60.Og sample of Actinium-225, what mass of the parent isotope (Ac) would remain at the end of the month (30 days)?
What’s the answer

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.